21 CM LINE UF twenty one cm line BT RADIO RECOMBINATION LINES RT H I ABSORPTION H I CLOUDS H I CONTENT H I EMISSION H I REGIONS NEUTRAL HYDROGEN 53 PERSEI STARS BT B STARS PULSATING VARIABLE STARS A DWARF STARS BT A STARS DWARF STARS RT A SUBDWARF STARS A GIANT STARS BT A STARS GIANT STARS A STARS BT EARLY TYPE STARS NT A DWARF STARS A GIANT STARS A SUBDWARF STARS A SUBGIANT STARS A SUPERGIANT STARS Ae STARS Am STARS Ap STARS RT EARLY TYPE VARIABLE STARS SPECTRAL TYPES A SUBDWARF STARS BT A STARS SUBDWARF STARS RT A DWARF STARS A SUBGIANT STARS BT A STARS SUBGIANT STARS A SUPERGIANT STARS BT A STARS EARLY TYPE SUPERGIANT STARS SUPERGIANT STARS ab variable stars U BAILEY TYPES RR LYRAE STARS ABELL CLUSTERS BT CLUSTERS OF GALAXIES ABERRATION Of starlight. RT ASTROMETRY COORDINATE SYSTEMS ABERRATIONS Of optical images NT ASTIGMATISM CHROMATIC ABERRATION COMA DISTORTION FIELD CURVATURE SPHERICAL ABERRATION RT FOCUS LENSES MIRRORS OPTICAL SYSTEMS OPTICS TELESCOPES ABLATION RT METEORITES ABNORMAL SPECTRA RT PECULIAR STARS absolute intensity U LUMINOSITY ABSOLUTE MAGNITUDE BT MAGNITUDES RT DISTANCE DISTANCE MODULUS HERTZSPRUNG RUSSELL DIAGRAM LUMINOSITY WILSON BAPPU EFFECT ABSOLUTE TEMPERATURE SCALE BT TEMPERATURE SCALES RT CELSIUS TEMPERATURE SCALE KELVIN TEMPERATURE ABSORPTION Combine with other terms NT ATMOSPHERIC EXTINCTION INTERGALACTIC ABSORPTION INTERSTELLAR ABSORPTION LIGHT ABSORPTION RT ATMOSPHERIC SCATTERING ATMOSPHERIC WINDOWS CAPTURE EQUIVALENT WIDTHS INTERSTELLAR GAS OPACITY PHOTODISSOCIATION PHOTOIONIZATION RADIATION RADIATIVE EQUILIBRIUM REDDENED STARS REDDENING ROSSELAND OPACITY TRANSMISSION ABSORPTION COEFFICIENT UF absorptivity RT ATMOSPHERIC EXTINCTION EINSTEIN COEFFICIENT INTERGALACTIC ABSORPTION INTERSTELLAR ABSORPTION OPTICAL DEPTH TRANSPARENCY ABSORPTION LINES BT SPECTRAL LINES RT ATOMIC PROCESSES BOUND FREE TRANSITIONS CALCIUM LINES CYANOGEN LINES LINE FORMATION LINE IDENTIFICATIONS LINE PROFILES LINE RATIOS LYMAN ALPHA FOREST METAL LINES MICROTURBULENCE RESIDUAL INTENSITY SPECTRA SPECTROSCOPIC ANALYSIS VOIGT PROFILES absorption nebulae U DARK NEBULAE ABSORPTION SPECTRA BT LINE SPECTRA SPECTRA NT ATOMIC SPECTRA RT BALMER SERIES BOUND FREE TRANSITIONS D LINES ENERGY SPECTRA FRAUNHOFER LINES RAMAN EFFECT ABSORPTION SPECTROSCOPY BT SPECTROSCOPY absorptivity U ABSORPTION COEFFICIENT ABUNDANCE May be combined with elements, e.g. helium abundance UF chemical abundance element abundance stellar abundance NT COSMIC ABUNDANCE ISOTOPIC ABUNDANCE METAL ABUNDANCE RT ABUNDANCE RATIOS CHEMICAL COMPOSITION CHEMICAL ELEMENTS CHEMICAL EVOLUTION CNO ANOMALIES CURVES OF GROWTH ELEMENT FORMATION HEAVY ELEMENTS HELIUM POOR STARS HELIUM RICH STARS PECULIAR STARS RARE EARTHS ABUNDANCE RATIOS RT ABUNDANCE CNO ANOMALIES ACCELERATION BT KINEMATICS RT DECELERATION GRAVIMETRY ORBITAL ELEMENTS ORBITS acceleration of gravity U GRAVITY SURFACE GRAVITY ACCRETION RT ACCRETION DISKS ALFVEN SURFACE BINARY STARS MASS TRANSFER PARTICLE ACCRETION ACCRETION DISKS BT DISKS RT ACCRETION BLACK HOLES CIRCUMSTELLAR DISKS CLOSE BINARY STARS COOLING FLOWS STELLAR WINDS U GEMINORUM STARS ACHONDRITES BT CHONDRITES METEORITES ACOUSTIC WAVES UF sound sound waves BT WAVES RT ACOUSTICS GRAVITY WAVES SPEED OF SOUND WAVELENGTH ACOUSTICS RT ACOUSTIC WAVES ACTIVE GALACTIC NUCLEI UF agn BT GALACTIC NUCLEI VARIABLE SOURCES X RAY SOURCES NT BLAZARS SEYFERT NUCLEI RT ACTIVE GALAXIES BL LACERTAE OBJECTS COMPACT NUCLEI EMISSION LINE GALAXIES GALAXIES QUASARS RADIO GALAXIES ACTIVE GALAXIES UF eruptive galaxies BT GALAXIES X RAY SOURCES RT ACTIVE GALACTIC NUCLEI COMPACT GALAXIES EMISSION LINE GALAXIES X RAY FLARES ACTIVE OPTICS BT OPTICS RT ADAPTIVE OPTICS ATMOSPHERIC REFRACTION MULTIPLE MIRROR TELESCOPES SEEING TIP TILT MIRRORS ACTIVE PROMINENCES BT PROMINENCES ACTIVE STARS NT EMISSION LINE STARS X RAY STARS RT X RAY FLARES ACTIVE SUN RT FLARES QUIET SUN SOLAR ACTIVITY SOLAR CYCLE SUNSPOTS ACTIVITY INDEXES RT SOLAR ACTIVITY ADAPTION Combine with other terms ADAPTIVE OPTICS BT OPTICS RT ACTIVE OPTICS ATMOSPHERIC REFRACTION SEEING SEGMENTED OPTICS ADIABATIC PROCESS RT ENERGY TRANSFER THERMODYNAMICS ADJUSTMENT Combine with other terms RT ALIGNMENT [OPTICS] COLLIMATION CORRECTIONS OPTICS ORIENTATION ADSORPTION Combine with other terms RT DUST GRAINS INTERPLANETARY GRAINS INTERSTELLAR DUST Ae STARS UF herbig stars BT A STARS EARLY TYPE EMISSION STARS RT Be STARS aerials U ANTENNAS AEROLITES BT METEORITES AERONOMY RT ATMOSPHERES EARTH ATMOSPHERE PLANETS AFTERGLOW BT ATMOSPHERIC RADIATION RT LIGHT SCATTERING LUMINESCENCE agb U ASYMPTOTIC GIANT BRANCH AGE Combine with other terms RT HUBBLE TIME RELAXATION TIME TURNOFF POINT agn U ACTIVE GALACTIC NUCLEI ai velorum stars U DELTA SCUTI STARS AIR BT GASES RT ATMOSPHERES AIR CONDITIONING RT TEMPERATURE CONTROL VENTILATION AIR POLLUTION BT POLLUTION RT LIGHT POLLUTION SITE PROTECTION air showers U COSMIC RAY SHOWERS AIRGLOW UF dayglow nightglow BT ATMOSPHERIC RADIATION RT ASHEN LIGHT AURORAS NIGHT SKY BRIGHTNESS RADIATIVE RECOMBINATION RAYLEIGH SCATTERING SKY BRIGHTNESS AIRPLANE BORNE INSTRUMENTS RT BALLOON BORNE INSTRUMENTS GROUND BASED ASTRONOMY INFRARED OBSERVATORIES ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS AIRY DISKS RT DIFFRACTION ALBEDO UF spherical albedo BT OPTICAL PROPERTIES RT ILLUMINATION RADIATION REFLECTION SURFACE PROPERTIES ALFVEN SURFACE RT ACCRETION NEUTRON STARS alfven waves U MAGNETOHYDRODYNAMICS ALGOL VARIABLE STARS UF beta persei stars BT BINARY STARS ECLIPSING BINARY STARS RT W URSAE MAJORIS STARS ALIGNMENT [OPTICS] Of optical images RT ADJUSTMENT COLLIMATION CORRECTIONS ORIENTATION ALIGNMENT [PLANETS] Of planets, etc RT CELESTIAL MECHANICS PLANETS SOLAR SYSTEM ALL SKY CAMERAS BT CAMERAS WIDE FIELD TELESCOPES RT ALL SKY PHOTOGRAPHY WIDE ANGLE LENSES ALL SKY PHOTOGRAPHY BT PHOTOGRAPHY RT ALL SKY CAMERAS CAMERAS WIDE ANGLE LENSES ALMANACS RT EPHEMERIDES ALPHA PARTICLES BT BOSONS COMPOSITE PARTICLES NUCLEAR RADIATION PARTICLES RT ELECTRONS NEUTRONS PROTONS RADIOACTIVITY ALPHA2 CANUM VENATICORUM STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS MAGNETIC VARIABLE STARS NT SX ARIETIS STARS RT Ap STARS SPECTRUM VARIABLE STARS ALTAZIMUTH MOUNTING UF azimuth mounting BT TELESCOPE MOUNTINGS RT ALTITUDE [ANGLE] AZIMUTH EQUATORIAL MOUNTING HORIZON COORDINATE SYSTEM SIDEROSTATS VERTICAL CIRCLES ALTIMETERS BT MEASURING INSTRUMENTS ALTIMETRY ALTITUDE [ANGLE] Use for angle; see ELEVATION for height. UF elevation angle RT ALTAZIMUTH MOUNTING AZIMUTH HORIZON HORIZON COORDINATE SYSTEM SEXTANTS ZENITH DISTANCE altitude [height] U ELEVATION aluminium coatings U ALUMINUM COATINGS ALUMINIZING RT ALUMINUM COATINGS MIRRORS VACUUM TECHNIQUES ALUMINUM COATINGS UF aluminium coatings BT COATINGS THIN FILMS RT ALUMINIZING MIRRORS SILVER COATINGS SURFACES [OPTICAL] VACUUM TECHNIQUES VAPOR DEPOSITION AM CANUM VENATICORUM STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS HYDROGEN DEFICIENT STARS RT U GEMINORUM STARS AM HERCULIS STARS UF polars BT CLOSE BINARY STARS Am STARS BT A STARS MAGNETIC STARS MAGNETIC VARIABLE STARS METAL RICH STARS NT SPECTRUM VARIABLE STARS AMATEUR ASTRONOMY RT ASTRONOMERS ASTRONOMICAL RESEARCH AMMONIA BT INTERSTELLAR MOLECULES AMOR GROUP BT MINOR PLANET FAMILIES RT APOLLO GROUP TROJAN GROUP AMPLIFIERS NT PARAMETRIC AMPLIFIERS PREAMPLIFIERS RT IMAGE TUBES PHOTOMULTIPLIER TUBES PULSE COUNTERS PULSE COUNTING AMPLITUDES RT DECAY [OSCILLATIONS] MAGNITUDES OSCILLATIONS PULSATIONS VARIABLE STARS VIBRATION ANALOG RECORDERS RT DATA STORAGE ANALYSES Combine with other terms NT DATA ANALYSIS FINE ANALYSES SIGNAL ANALYSIS SIGNAL PROCESSING RT ASTRONOMICAL TECHNIQUES QUANTIZATION REDUCTION METHODS ancient astronomy U ARCHAEOASTRONOMY ANGLE OF REFRACTION In earth's atmosphere RT ATMOSPHERES ZENITH DISTANCE angular coordinates U SPHERICAL COORDINATES ANGULAR DIAMETERS UF apparent diameters BT DIAMETERS RT INTERFEROMETRY OCCULTATIONS SPECKLE INTERFEROMETRY angular distance U ANGULAR SEPARATION ANGULAR MOMENTUM RT G FACTOR KINEMATICS MOMENTUM ROTATION ANGULAR RESOLUTION BT RESOLUTION RT ANGULAR SEPARATION BEAMWIDTH OPTICS SPECKLE INTERFEROMETRY ANGULAR SEPARATION UF angular distance RT ANGULAR RESOLUTION OPTICAL DOUBLE STARS SPECKLE INTERFEROMETRY ANGULAR VELOCITY BT VELOCITY RT CELESTIAL MECHANICS ORBITAL VELOCITY ROTATION ANISOTROPY RT BACKGROUND RADIATION ISOTROPY POLARIZATION [CHARGE SEPARATION] ANNUAL EQUATION RT EARTH MOON SYSTEM EARTH ORBIT ELLIPTICAL ORBITS ANNUAL PARALLAX UF heliocentric parallax BT PARALLAXES RT ASTRONOMICAL UNIT ANNULAR ECLIPSES BT ECLIPSES RT TOTAL ECLIPSES ANOMALIES NT GRAVITY ANOMALIES MAGNETIC ANOMALIES ANOMALISTIC MONTH RT ANOMALY MOON ANOMALISTIC YEAR BT YEAR RT ANOMALY ANOMALY UF apparent anomaly eccentric anomaly mean anomaly real anomaly true anomaly BT ORBITAL ELEMENTS RT ANOMALISTIC MONTH ANOMALISTIC YEAR ANSAE RT LENTICULAR GALAXIES PLANETARY NEBULAE RINGS ANTAPEX RT APEX SOLAR MOTION ANTARCTIC OBSERVATORIES BT OBSERVATORIES ANTENNA DESIGN RT POLAR DIAGRAM RADIO TELESCOPES ANTENNAS UF aerials BT RADAR EQUIPMENT NT CASSEGRAIN ANTENNAS DIPOLE ANTENNAS HORN ANTENNAS LENS ANTENNAS MICROWAVE ANTENNAS MILLS CROSS ANTENNAS PARABOLIC ANTENNAS RADIO ANTENNAS REFLECTOR ANTENNAS YAGI ANTENNAS RT ARRAYS CURRENT SHEETS CURRENTS DISH ANTENNAS FEED HORNS INTERFEROMETERS RADAR RADIO TELESCOPES TELESCOPES ANTHROPIC PRINCIPLE RT COSMOLOGY LIFE anticenter U GALACTIC ANTICENTER ANTIMATTER NT ANTIPARTICLES ANTINEUTRINOS BT ANTIPARTICLES RT NEUTRINOS ANTINODES RT VIBRATION ANTINUCLEONS BT ANTIPARTICLES ANTIPARTICLES BT ANTIMATTER ELEMENTARY PARTICLES NT ANTINEUTRINOS ANTINUCLEONS ANTIPROTONS POSITRONS ANTIPROTONS BT ANTIPARTICLES RT PROTONS ANTIREFLECTION COATINGS BT COATINGS OPTICAL FILMS THIN FILMS RT LENSES SURFACES [OPTICAL] Ap STARS UF peculiar a stars BT A STARS PECULIAR STARS NT HOLMIUM STARS MANGANESE STARS SILICON STARS SPECTRUM VARIABLE STARS RT ALPHA2 CANUM VENATICORUM STARS MAGNETIC STARS MAGNETIC VARIABLE STARS OBLIQUE ROTATORS RAPID OSCILLATIONS APASTRON BT APSIDES RT PERIASTRON APERIODIC COMETS BT COMETS APERTURE SYNTHESIS UF grading function synthetic aperture RT APERTURES GRATING RING INTERFEROMETRY VISIBILITY FUNCTION APERTURES RT APERTURE SYNTHESIS APODIZATION OPTICAL SYSTEMS APEX RT ANTAPEX SOLAR MOTION APHELION BT APSIDES RT EARTH ORBIT PERIHELION PLANETS APOCENTER RT BINARY STARS APODIZATION RT APERTURES RADIO TELESCOPES APOGEE BT APSIDES RT MOON PERIGEE APOLLO GROUP BT MINOR PLANET FAMILIES RT AMOR GROUP HIRAYAMA FAMILIES TROJAN GROUP apparent anomaly U ANOMALY apparent diameters U ANGULAR DIAMETERS APPARENT INTENSITY BT INTENSITY APPARENT MAGNITUDES BT MAGNITUDES NT B MAGNITUDE H MAGNITUDE I MAGNITUDE J MAGNITUDE K MAGNITUDE L MAGNITUDE M MAGNITUDE N MAGNITUDE O MAGNITUDE P MAGNITUDE PHOTOELECTRIC MAGNITUDES PHOTOGRAPHIC MAGNITUDES PHOTOVISUAL MAGNITUDES Q MAGNITUDE R MAGNITUDE U MAGNITUDE V MAGNITUDE RT PHOTOMETRIC SYSTEMS PHOTOMETRY apparent places U APPARENT POSITIONS APPARENT POSITIONS UF apparent places BT POSITIONS RT ASTROMETRY TRUE POSITIONS APPARENT SUPERLUMINAL MOTION UF superluminal motion BT MOTION RT VELOCITY OF LIGHT apse U APSIDES APSIDAL MOTIONS BT MOTION RT APSIDES ORBITS APSIDES UF apse apsis BT ORBITAL ELEMENTS NT APASTRON APHELION APOGEE PERIASTRON PERIGEE PERIHELION RT APSIDAL MOTIONS ORBITS apsis U APSIDES ARCHAEOASTRONOMY UF ancient astronomy astroarchaeology BT ASTRONOMY HISTORY OF ASTRONOMY NT MEGALITHIC ASTRONOMY RT ARMILLARY SPHERES ASTROLABES ASTROLOGY arcs U LUMINOUS ARCS area photometry U SURFACE PHOTOMETRY ARMILLARY SPHERES RT ARCHAEOASTRONOMY arms U SPIRAL ARMS ARRAY PROCESSORS RT DETECTOR ARRAYS ARRAYS NT DETECTOR ARRAYS DIODE ARRAYS PHASED ARRAYS T ARRAYS TELESCOPE ARRAYS VERY LARGE ARRAYS Y ARRAYS RT ANTENNAS GRATING RESPONSE INTERFEROMETERS RADIO INTERFEROMETERS RADIO TELESCOPES ARTIFICIAL SATELLITES Named satellite observatories not included. UF satellites NT GEOSTATIONARY SATELLITES RT GAMMA RAY OBSERVATORIES ORBITING OBSERVATORIES POLAR ORBITS SATELLITE LASER RANGING SPACE ASTRONOMY SPACE TELESCOPES SPACE VEHICLES X RAY OBSERVATORIES ascending nodes U NODES ASHEN LIGHT Refers to Venus' atmosphere BT ATMOSPHERIC RADIATION RT AIRGLOW ASTEROID BELT RT MINOR PLANETS ASTEROIDS See under MINOR PLANETS ASTEROSEISMOLOGY UF stellar seismology BT SEISMOLOGY NT HELIOSEISMOLOGY RT PULSATING VARIABLE STARS PULSATIONS RAPID OSCILLATIONS SOLAR OSCILLATIONS STELLAR OSCILLATIONS ASTIGMATISM BT ABERRATIONS RT CHROMATIC ABERRATION COMA DISTORTION FIELD CURVATURE SPHERICAL ABERRATION astroarchaeology U ARCHAEOASTRONOMY astrobiology U EXOBIOLOGY astrochemistry U COSMOCHEMISTRY ASTRODYNAMICS RT CELESTIAL MECHANICS ASTROGRAPHIC CAMERAS BT CAMERAS ASTROGRAPHIC CATALOGS BT CATALOGS ASTROGRAPHS BT ASTROMETRIC INSTRUMENTS ASTROLABES BT ASTROMETRIC INSTRUMENTS INSTRUMENTATION NT DANJON ASTROLABES IMPERSONAL ASTROLABES RT ARCHAEOASTRONOMY ASTROLOGY RT ARCHAEOASTRONOMY ASTRONOMY CONSTELLATIONS PLANETS ZODIAC ASTROMETRIC BINARY STARS BT BINARY STARS ASTROMETRIC INSTRUMENTS BT INSTRUMENTATION NT ASTROGRAPHS ASTROLABES QUADRANTS SEXTANTS TRANSIT INSTRUMENTS RT ASTROMETRY TIME ASTROMETRY UF positional astronomy BT ASTRONOMICAL TECHNIQUES ASTRONOMY OBSERVING TECHNIQUES NT PHOTOGRAPHIC ASTROMETRY RADIO ASTROMETRY SPACE ASTROMETRY RT ABERRATION APPARENT POSITIONS ASTROMETRIC INSTRUMENTS ASTRONOMICAL GEODESY CELESTIAL MECHANICS COORDINATE SYSTEMS EARTH ROTATION EQUATOR POSITION FUNDAMENTAL STARS LATITUDE DETERMINATION MERIDIAN CIRCLES OPTICAL POSITIONS PARALLAXES PRECESSION REFERENCE SYSTEMS STELLAR MOTIONS TRANSIT INSTRUMENTS TRANSITS TRUE POSITIONS ASTRONOMERS RT AMATEUR ASTRONOMY ASTRONOMICAL RESEARCH ASTRONOMICAL CONSTANTS BT CONSTANTS FUNDAMENTAL CONSTANTS NT ASTRONOMICAL UNIT GRAVITATIONAL CONSTANT RT CELESTIAL MECHANICS ASTRONOMICAL GEODESY BT GEODESY RT ASTROMETRY astronomical instruments U INSTRUMENTATION ASTRONOMICAL OPTICS BT OPTICS ASTRONOMICAL RESEARCH NT SPACE RESEARCH RT AMATEUR ASTRONOMY ASTRONOMERS ASTRONOMICAL TECHNIQUES Most used in several wavelength regions. NT ASTROMETRY INTERFEROMETRY PHOTOMETRY POLARIMETRY SPECTROMETRY SPECTROPHOTOMETRY SPECTROSCOPY RT ANALYSES OBSERVING TECHNIQUES PHOTOGRAPHY REDUCTION METHODS ASTRONOMICAL UNIT BT ASTRONOMICAL CONSTANTS RT ANNUAL PARALLAX DISTANCE SCALE HELIOCENTRIC CORRECTION PARALLAXES PARSEC SOLAR PARALLAX TRIGONOMETRIC PARALLAX ASTRONOMY Combine with other terms NT ARCHAEOASTRONOMY ASTROMETRY ASTROPHYSICS COSMOGONY COSMOLOGY GROUND BASED ASTRONOMY RT ASTROLOGY astrophotography U PHOTOGRAPHY astrophysical jets U JETS ASTROPHYSICS Combine with other terms UF theoretical astrophysics BT ASTRONOMY RT COSMOLOGY ASYMPTOTIC GIANT BRANCH UF agb RT HERTZSPRUNG RUSSELL DIAGRAM LATE TYPE GIANT STARS ATAXITES BT METEORITES ATLASES UF charts NT STAR ATLASES RT CATALOGS FINDING CHARTS MAPS SKY SURVEYS SURVEYS ATMOSPHERES Combine with other terms NT EARTH ATMOSPHERE STELLAR ATMOSPHERES RT AERONOMY AIR ANGLE OF REFRACTION BOUNDARY LAYERS GREENHOUSE EFFECT LIMB BRIGHTENING LIMB DARKENING MACROTURBULENCE MICROTURBULENCE OPACITY PLANETS RADIATION BELTS SCALE HEIGHT SCINTILLATION TEMPERATURE ZONES WATER VAPOR ATMOSPHERIC DENSITY BT DENSITY RT SCALE HEIGHT ATMOSPHERIC EXTINCTION Refers to earth atmosphere. UF extinction BT ABSORPTION SCATTERING RT ABSORPTION COEFFICIENT ATMOSPHERIC WINDOWS EARTH ATMOSPHERE LIGHT ABSORPTION LIGHT SCATTERING ULTRAVIOLET EXTINCTION ATMOSPHERIC RADIATION UF sky radiation BT TERRESTRIAL RADIATION NT AFTERGLOW AIRGLOW ASHEN LIGHT AURORAS RT SKY BRIGHTNESS ATMOSPHERIC REFRACTION RT ACTIVE OPTICS ADAPTIVE OPTICS ATMOSPHERIC SCINTILLATION POINT SPREAD FUNCTION REFRACTIVE INDEX SCINTILLATION SEEING SPECKLES ATMOSPHERIC SCATTERING RT ABSORPTION EARTH ATMOSPHERE ATMOSPHERIC SCINTILLATION UF twinkling BT SCINTILLATION RT ATMOSPHERIC REFRACTION EARTH ATMOSPHERE SEEING ATMOSPHERIC TIDES BT TIDES ATMOSPHERIC WINDOWS Spectral ranges transmitted by the earth's atmosphere. BT WINDOWS NT INFRARED WINDOWS OPTICAL WINDOWS RADIO WINDOWS RT ABSORPTION ATMOSPHERIC EXTINCTION EARTH ATMOSPHERE TRANSPARENCY ATOMIC CLOCKS UF cesium clocks BT CLOCKS MEASURING INSTRUMENTS RT ATOMIC TIME GEODESY TIME TIME STANDARDS TIME SYNCHRONIZATION VERY LONG BASELINE INTERFEROMETRY ATOMIC LINES RT ATOMIC SPECTRA ATOMIC PHYSICS Combine with other terms ATOMIC PROCESSES RT ABSORPTION LINES EMISSION LINES EXCITATION POPULATION INVERSION ATOMIC SPECTRA BT ABSORPTION SPECTRA SPECTRA RT ATOMIC LINES ATOMIC TIME RT ATOMIC CLOCKS ATOMS RT CHEMICAL ELEMENTS ATTENUATION RT FILTERS auger showers U COSMIC RAY SHOWERS AURORAL ARCS BT AURORAS AURORAL JETS BT AURORAS AURORAS BT ATMOSPHERIC RADIATION NT AURORAL ARCS AURORAL JETS RT AIRGLOW LIGHT EMISSION MAGNETIC DISTURBANCES MAGNETIC POLES MAGNETIC STORMS NIGHT SKY BRIGHTNESS PHOTOIONIZATION RAYLEIGH SKY BRIGHTNESS SOLAR ACTIVITY UPPER ATMOSPHERE AUSTRALITES BT METEORITES TEKTITES RT BEDIASITES CHONDRITES MOLDAVITES AUTOGUIDERS BT CONTROL SYSTEMS GUIDE SYSTEMS RT AUTOMATIC PATROL TELESCOPES QUADRANT DETECTORS TRACKING AUTOMATED TELESCOPES UF robotic telescopes BT TELESCOPES NT AUTOMATIC PATROL TELESCOPES RT REMOTE CONTROL SYSTEMS AUTOMATIC PATROL TELESCOPES BT AUTOMATED TELESCOPES OPTICAL TELESCOPES RT AUTOGUIDERS PHOTOMETRY REMOTE CONTROL SYSTEMS AUTUMNAL EQUINOX BT EQUINOXES RT VERNAL EQUINOX AUXILIARY INSTRUMENTS BT INSTRUMENTATION AVALANCHE PHOTODIODES BT PHOTODIODES PHOTOELECTRONIC DEVICES RT PHOTOMETRY AXES Combine with other terms AXIONS BT ELEMENTARY PARTICLES AZIMUTH UF bearing RT ALTAZIMUTH MOUNTING ALTITUDE [ANGLE] HORIZON HORIZON COORDINATE SYSTEM azimuth mounting U ALTAZIMUTH MOUNTING b BAND BT FRAUNHOFER LINES MOLECULAR BANDS RT MOLECULAR SPECTRA B DWARF STARS BT B STARS DWARF STARS NT GAMMA CASSIOPEIAE STARS B GIANT STARS BT B STARS GIANT STARS B MAGNITUDE BT APPARENT MAGNITUDES RT JOHNSON PHOTOMETRY B STARS BT EARLY TYPE STARS OB STARS YOUNG STARS NT 53 PERSEI STARS B DWARF STARS B GIANT STARS B SUBDWARF STARS B SUPERGIANT STARS Be STARS Bp STARS Bw STARS MERCURY MANGANESE STARS RT EARLY TYPE VARIABLE STARS O CLUSTERS SPECTRAL TYPES B SUBDWARF STARS BT B STARS SUBDWARF STARS B SUPERGIANT STARS BT B STARS EARLY TYPE SUPERGIANT STARS OB SUPERGIANT STARS SUPERGIANT STARS Ba II stars U BARIUM STARS BAADE WESSELINK METHOD RT CEPHEIDS DIAMETERS BACKGROUND Combine with other terms BACKGROUND NOISE BT NOISE RT COSMIC NOISE SIGNAL TO NOISE RATIO SKY NOISE BACKGROUND RADIATION UF cosmic background radiation radiation background BT RADIATION NT COSMIC RAYS GAMMA RAY BACKGROUND MICROWAVE BACKGROUND RADIO BACKGROUND ULTRAVIOLET BACKGROUND X RAY BACKGROUND RT ANISOTROPY COSMIC NOISE SKY BRIGHTNESS SUNYAEV ZELDOVICH EFFECT BAILEY TYPES UF ab variable stars BT RR LYRAE STARS BAILYS BEADS RT DIAMOND RING EFFECT SOLAR ECLIPSE SUN BAKER NUNN CAMERAS BT CATADIOPTRIC SYSTEMS METEOR CAMERAS REFLECTING TELESCOPES WIDE FIELD TELESCOPES RT BOUWERS TELESCOPES SCHMIDT TELESCOPES BALLOON BORNE INSTRUMENTS RT AIRPLANE BORNE INSTRUMENTS COSMIC RAY ASTRONOMY GAMMA RAY ASTRONOMY GROUND BASED ASTRONOMY ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE PROBE INSTRUMENTS SPACE TELESCOPES ULTRAVIOLET ASTRONOMY X RAY ASTRONOMY BALMER CONTINUUM RT BALMER SERIES HYDROGEN SPECTRUM BALMER LIMIT RT BALMER SERIES HYDROGEN SPECTRUM balmer lines U BALMER SERIES BALMER SERIES UF balmer lines RT ABSORPTION SPECTRA BALMER CONTINUUM BALMER LIMIT BRACKETT SERIES H ALPHA H BETA HYDROGEN SPECTRUM LYMAN SERIES PASCHEN SERIES PFUND SERIES BARIUM STARS UF Ba II stars NT SEMIBARIUM STARS RT HEAVY METAL STARS S STARS BARRED SPIRAL GALAXIES UF galactic bars BT GALAXIES SPIRAL GALAXIES BARYON STARS RT BARYONIC DARK MATTER BARYONS BARYONIC DARK MATTER RT BARYON STARS COLD DARK MATTER BARYONS BT ELEMENTARY PARTICLES RT BARYON STARS QUARKS BASINS RT CRATERS Be dwarf stars U Be STARS Be STARS UF Be dwarf stars herbig stars BT B STARS EARLY TYPE EMISSION STARS NT LAMBDA ERIDANI STARS RT Ae STARS CIRCUMSTELLAR SHELLS BEAM SWITCHING RT RADIO TELESCOPES BEAM WAVEGUIDES RT COLLIMATORS BEAMWIDTH RT ANGULAR RESOLUTION POLAR DIAGRAM RADIO TELESCOPES bearing U AZIMUTH beat cepheids U DOUBLE MODE CEPHEIDS BEDIASITES BT METEORITES TEKTITES RT AUSTRALITES CHONDRITES MOLDAVITES BESSELIAN EPOCH BT EPOCH STANDARD EPOCH RT JULIAN EPOCH TIME beta canis majoris stars U BETA CEPHEI STARS BETA CEPHEI STARS UF beta canis majoris stars ultra short period B stars ultra short period variable stars BT EARLY TYPE VARIABLE STARS MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS SHORT PERIOD VARIABLE STARS RT NONRADIAL PULSATIONS RADIAL PULSATIONS BETA LYRAE STARS BT CLOSE BINARY STARS CONTACT BINARY STARS ECLIPSING BINARY STARS ELLIPSOIDAL VARIABLE STARS beta persei stars U ALGOL VARIABLE STARS BIANCHI COSMOLOGY BT COSMOLOGY BIG BANG THEORY BT COSMOLOGY RT CLOSED UNIVERSE EARLY UNIVERSE FRIEDMANN UNIVERSE HADRON BARRIER HUBBLE RADIUS HUBBLE TIME LEMAITRE UNIVERSE OPEN UNIVERSE PRIMORDIAL FIREBALL RELATIVISTIC VELOCITY STEADY STATE THEORY binaries U BINARY STARS binary galaxies U DOUBLE GALAXIES BINARY PULSARS BT PULSARS BINARY STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF binaries binary systems double stars wide binary stars NT ALGOL VARIABLE STARS ASTROMETRIC BINARY STARS CATACLYSMIC VARIABLE STARS CLOSE BINARY STARS CONTACT BINARY STARS DETACHED BINARY STARS ECLIPSING BINARY STARS ELLIPSOIDAL VARIABLE STARS ERUPTIVE BINARY STARS INTERACTING BINARY STARS RS CANUM VENATICORUM STARS SEMIDETACHED BINARY STARS SPECTROSCOPIC BINARY STARS VISUAL BINARY STARS RT ACCRETION APOCENTER CENTER OF MASS COMPANION STARS DYNAMICAL PARALLAX INCLINATION MASS LOSS MASS RATIOS MULTIPLE STARS OCCULTATIONS ORBIT DETERMINATION ORBITS PERIOD PERIOD CHANGE PERIOD DETERMINATION PHASE [WAVE] POSITION ANGLE RUNAWAY STARS SEMIMAJOR AXIS SEPARATION TWO BODY PROBLEM VON ZEIPEL THEOREM binary systems U BINARY STARS DOUBLE GALAXIES bipolar flows U BIPOLAR OUTFLOWS BIPOLAR GALAXIES BT GALAXIES BIPOLAR GROUPS BT SUNSPOT GROUPS RT SUNSPOTS BIPOLAR NEBULAE BT NEBULAE RT BIPOLAR OUTFLOWS BIPOLAR OUTFLOWS UF bipolar flows RT BIPOLAR NEBULAE CIRCUMSTELLAR MATTER RADIO SOURCES RADIO STRUCTURE BIRTH RATES RT MASS FUNCTION PROTOSTARS STAR FORMATION STELLAR EVOLUTION BL HERCULIS STARS BT PULSATING VARIABLE STARS W VIRGINIS STARS RT CEPHEIDS RADIAL PULSATIONS RR LYRAE STARS bl lac objects U BL LACERTAE OBJECTS BL LACERTAE OBJECTS UF bl lac objects BT COMPACT OBJECTS EXTRAGALACTIC RADIO SOURCES GALAXIES VARIABLE SOURCES RT ACTIVE GALACTIC NUCLEI BLAZARS COMPACT GALAXIES QUASARS SEYFERT GALAXIES BLACK BODY RADIATION UF thermal black body radiation BT RADIATION RT BRIGHTNESS TEMPERATURE EMISSIVITY THERMAL RADIATION ULTRAVIOLET RADIATION BLACK DWARF STARS BT DWARF STARS LOW MASS STARS RT WHITE DWARF STARS BLACK HOLES BT COLLAPSED STARS COMPACT OBJECTS DEGENERATE MATTER RELATIVISTIC STARS NT KERR BLACK HOLE RT ACCRETION DISKS ERGOSPHERE EVENT HORIZON GALACTIC NUCLEI GRAVITATIONAL COLLAPSE GRAVITATIONAL LENSES HAWKING RADIATION KRUSKAL DIAGRAM MASSIVE OBJECTS NAKED SINGULARITY PENROSE PROCESS RELATIVISTIC ASTROPHYSICS SCHWARZSCHILD RADIUS SPACETIME SINGULARITY SUPERNOVA REMNANTS WHITE HOLES X RAY BINARY STARS BLANK FIELDS RT GALAXY VOIDS BLAZARS BT ACTIVE GALACTIC NUCLEI RT BL LACERTAE OBJECTS QUASARS BLAZHKO EFFECT RT RR LYRAE STARS BLINK COMPARATORS BT INSTRUMENTATION BLINKING Combine with other terms BLUE GALAXIES BT BLUE OBJECTS GALAXIES BLUE OBJECTS NT BLUE GALAXIES BLUE SHIFT BT DOPPLER EFFECT LINE SHIFT RT FREQUENCY SHIFT blue stars U EARLY TYPE STARS BLUE STRAGGLER STARS BT MAINSEQUENCE STARS YOUNG STARS RT OPEN STAR CLUSTERS BODES LAW UF titius bode law RT DISTANCE PLANETS SOLAR SYSTEM BOK GLOBULES BT DARK NEBULAE GLOBULES INTERSTELLAR MATTER RT H II REGIONS PROTOSTARS STAR FORMATION BOLIDES BT METEORS RT FIREBALLS BOLOMETERS BT INSTRUMENTATION RT BOLOMETRIC CORRECTION PHOTOMETERS RADIATION RADIOMETERS BOLOMETRIC CORRECTION RT BOLOMETERS BOSE EINSTEIN NUCLEI BT NUCLEI [ATOMS] RT BOSE EINSTEIN STATISTICS FERMI DIRAC NUCLEI BOSE EINSTEIN STATISTICS RT BOSE EINSTEIN NUCLEI BOSONS FERMI DIRAC STATISTICS BOSONS BT ELEMENTARY PARTICLES PARTICLES NT ALPHA PARTICLES COMPOSITE PARTICLES MESONS PHOTONS PIONS RT BOSE EINSTEIN STATISTICS FERMIONS HADRONS LEPTONS BOUND FREE TRANSITIONS RT ABSORPTION LINES ABSORPTION SPECTRA BOUNDARY LAYERS RT ATMOSPHERES PLANETS BOUWERS TELESCOPES BT CATADIOPTRIC SYSTEMS REFLECTING TELESCOPES RT BAKER NUNN CAMERAS MAKSUTOV TELESCOPES WIDE FIELD TELESCOPES BOW SHOCKS BT SHOCK WAVES Bp STARS BT B STARS MAGNETIC STARS PECULIAR STARS BRACKETT SERIES BT INFRARED RADIATION RT BALMER SERIES HYDROGEN SPECTRUM LYMAN SERIES PASCHEN SERIES PFUND SERIES BREMSSTRAHLUNG UF free free transition BT ELECTROMAGNETIC WAVES RADIATION RT ELECTRONS RADIATION MECHANISMS SPECTRA SYNCHROTRON RADIATION BRIDGES Between galaxies. BRIGHT GALAXIES BT GALAXIES RT LOCAL GROUP OF GALAXIES NEARBY GALAXIES BRIGHT NEBULAE BT NEBULAE bright stars U HIGH LUMINOSITY STARS BRIGHTNESS BT OPTICAL PROPERTIES NT SURFACE BRIGHTNESS RT ILLUMINATION INTEGRATION TIME INTENSITY LUMINOSITY MAGNITUDES BRIGHTNESS DISTRIBUTION See LUMINOSITY DISTRIBUTION BRIGHTNESS TEMPERATURE BT TEMPERATURE RT BLACK BODY RADIATION LUMINOSITY DISTRIBUTION OPTICAL PROPERTIES BRILLOUIN SCATTERING RT BRILLOUIN SPECTRA MIE SCATTERING BRILLOUIN SPECTRA BT SPECTRA RT BRILLOUIN SCATTERING LIGHT SCATTERING BROAD BAND PHOTOMETRY UF wide band photometry BT CCD PHOTOMETRY PHOTOELECTRIC PHOTOMETRY PHOTOGRAPHIC PHOTOMETRY NT BV PHOTOMETRY CAPE PHOTOMETRY CAPE RI PHOTOMETRY INFRARED PHOTOMETRY JOHNSON PHOTOMETRY RGU PHOTOMETRY TWO COLOR PHOTOMETRY UBVRIJKL PHOTOMETRY ULTRAVIOLET PHOTOMETRY RT MEDIUM BAND PHOTOMETRY NARROW BAND PHOTOMETRY BROWN DWARF STARS BT DWARF STARS LOW MASS STARS bubbles U INTERSTELLAR BUBBLES BULGES Combine with other terms bump cepheids U CEPHEIDS BURSTERS RT BURSTS GAMMA RAY BURSTS OPTICAL BURSTS RADIO BURSTS X RAY BURSTS BURSTS NT GAMMA RAY BURSTS OPTICAL BURSTS OUTBURSTS RADIO BURSTS RAPID BURSTS X RAY BURSTS RT BURSTERS FLARES BUTTERFLY DIAGRAM RT SOLAR ACTIVITY SOLAR CYCLE SUNSPOT CYCLE SUNSPOT NUMBERS SUNSPOTS BV PHOTOMETRY BT BROAD BAND PHOTOMETRY RT JOHNSON PHOTOMETRY TWO COLOR PHOTOMETRY Bw STARS BT B STARS HELIUM POOR STARS BY DRACONIS STARS BT FLARE STARS RT STARSPOTS c I emission U CARBON LINES C II REGIONS BT INTERSTELLAR MATTER RT DARK CLOUDS c m diagrams U COLOR MAGNITUDE RELATION c m relation U COLOR MAGNITUDE RELATION c stars U CARBON STARS Ca II EMISSION LINES BT CALCIUM LINES EMISSION LINES METAL LINES RT WILSON BAPPU EFFECT CALCIUM LINES BT METAL LINES SPECTRAL LINES NT Ca II EMISSION LINES H AND K LINES K LINE RT ABSORPTION LINES CALENDARS NT GREGORIAN CALENDAR JULIAN CALENDAR RT EPHEMERIDES TIME CALIBRATION Combine with other terms NT SELF CALIBRATION METHODS RT INSTRUMENTATION MEASURING INSTRUMENTS RESEAUX CAMERA LENSES BT LENSES RT CAMERAS CAMERAS Photographic types only here. BT OPTICAL INSTRUMENTS PHOTOGRAPHIC INSTRUMENTS NT ALL SKY CAMERAS ASTROGRAPHIC CAMERAS SCHMIDT CAMERAS ULTRAVIOLET CAMERAS RT ALL SKY PHOTOGRAPHY CAMERA LENSES CORONAGRAPHS PHOTOGRAPHS PHOTOGRAPHY ULTRAVIOLET PHOTOGRAPHY WIDE ANGLE LENSES candoluminescence U LUMINESCENCE CAPE PHOTOMETRY UF UcBV photometry BT BROAD BAND PHOTOMETRY PHOTOMETRIC SYSTEMS RT CAPE RI PHOTOMETRY JOHNSON PHOTOMETRY KAPTEYN SELECTED AREAS CAPE RI PHOTOMETRY BT BROAD BAND PHOTOMETRY RT CAPE PHOTOMETRY JOHNSON PHOTOMETRY CAPTURE Combine with other terms RT ABSORPTION CARBON BURNING BT NUCLEAR FUSION NUCLEOSYNTHESIS RT CARBON FLASH GIANT STARS HELIUM BURNING HYDROGEN BURNING NUCLEAR REACTIONS OXYGEN BURNING SHELL BURNING SILICON BURNING STELLAR EVOLUTION STELLAR INTERIORS CARBON COMPOUNDS BT INTERSTELLAR MOLECULES NT CARBON DIOXIDE CARBON DISULFIDE CARBON MONOSULFIDE CARBON MONOXIDE CH CYANOACETYLENE CYANODIACETYLENE CYANOGEN CYANOPOLYYNES carbon cycle U CARBON NITROGEN CYCLE carbon detonation U CARBON FLASH CARBON DIOXIDE BT CARBON COMPOUNDS GASES CARBON DISULFIDE BT CARBON COMPOUNDS CARBON FLASH UF carbon detonation RT CARBON BURNING HELIUM FLASH NUCLEAR FUSION RED GIANT TIP CARBON LINES UF c I emission BT METAL LINES SPECTRAL LINES CARBON MONOSULFIDE BT CARBON COMPOUNDS CARBON MONOXIDE UF co BT CARBON COMPOUNDS GASES RT SWAN BANDS CARBON NITROGEN CYCLE UF carbon cycle cno cno cycle BT HYDROGEN BURNING RT CNO ANOMALIES NUCLEAR FUSION PROTON PROTON REACTION STELLAR INTERIORS CARBON STARS UF c stars BT LATE TYPE GIANT STARS RT CH STARS CN STARS R STARS S STARS WOLF RAYET STARS CARBONACEOUS CHONDRITES BT CHONDRITES cascade showers U COSMIC RAY SHOWERS CASSEGRAIN ANTENNAS UF two reflector antennas BT ANTENNAS RADIO TELESCOPES RT SECONDARY MIRRORS SUBREFLECTORS CASSEGRAIN FOCUS UF cassegrain telescope BT FOCUS RT COUDE FOCUS NASMYTH FOCUS NEWTONIAN FOCUS PARABOLIC ANTENNAS PRIME FOCUS SECONDARY MIRRORS SUBREFLECTORS cassegrain telescope U CASSEGRAIN FOCUS cataclysmic binary stars U CATACLYSMIC VARIABLE STARS CATACLYSMIC VARIABLE STARS UF cataclysmic binary stars eruptive stars eruptive variable stars explosive variable stars BT BINARY STARS VARIABLE STARS NT ALPHA2 CANUM VENATICORUM STARS AM CANUM VENATICORUM STARS ERUPTIVE BINARY STARS GAMMA CASSIOPEIAE STARS NOVAS RW AURIGAE STARS SS CYGNI STARS SU URSAE MAJORIS STARS SUPERNOVAS SX ARIETIS STARS SYMBIOTIC STARS U GEMINORUM STARS UU HERCULIS STARS UV PERSEI STARS UX URSAE MAJORIS STARS WZ SAGITTAE STARS X RAY BINARY STARS Z CAMELOPARDALIS STARS RT ERUPTIONS INTERACTING BINARY STARS MASS EXCHANGE MASS LOSS OPTICAL OUTBURSTS CATADIOPTRIC SYSTEMS NT BAKER NUNN CAMERAS BOUWERS TELESCOPES MAKSUTOV TELESCOPES SCHMIDT TELESCOPES RT CORRECTOR PLATES FIELD CORRECTORS LENSES MIRRORS OPTICAL TELESCOPES CATALOGS e.g. RADIO, STAR, X RAY, etc Combine with other terms UF catalogues NT ASTROGRAPHIC CATALOGS HENRY DRAPER CATALOG RADIO SOURCE CATALOGS RT ATLASES EPHEMERIDES FINDING LISTS FK CATALOG SYSTEM FUNDAMENTAL STARS MAPS NOMENCLATURE SKY SURVEYS SURVEYS ULTRAVIOLET SURVEYS catalogues U CATALOGS CATASTROPHE THEORY RT MATHEMATICAL ANALYSIS CATHODES BT ELECTRODES NT PHOTOCATHODES RT PHOTOMULTIPLIER TUBES QUANTUM EFFICIENCY THERMIONIC EMISSION CATOPTRIC SYSTEMS RT MIRRORS OPTICAL TELESCOPES CCD Acroynm: CHARGE COUPLED DEVICE CCD CAMERAS CCD DETECTORS BT MULTICHANNEL DETECTORS TWO DIMENSIONAL DETECTORS RT CCD OBSERVATIONS CCD PHOTOMETRY CHARGE COUPLED DEVICES PHOTOMETERS TELEVISION DETECTORS CCD OBSERVATIONS RT CCD DETECTORS CCD PHOTOMETRY CHARGE COUPLED DEVICES CCD PHOTOMETRY BT PHOTOMETRY NT BROAD BAND PHOTOMETRY MEDIUM BAND PHOTOMETRY NARROW BAND PHOTOMETRY RT CCD DETECTORS CCD OBSERVATIONS CHARGE COUPLED DEVICES PHOTOELECTRIC PHOTOMETRY PHOTOGRAPHIC PHOTOMETRY cD GALAXIES BT D GALAXIES ELLIPTICAL GALAXIES GIANT GALAXIES RT GIANT RADIO GALAXIES MASSIVE GALAXIES NUCLEI [CELESTIAL OBJECTS] CELESTIAL COORDINATES See under COORDINATE SYSTEMS. CELESTIAL EQUATOR RT CELESTIAL POLES CELESTIAL SPHERE DECLINATION EQUATOR CORRECTION EQUATOR DETERMINATION EQUATOR POSITION EQUATORIAL COORDINATE SYSTEM EQUINOXES OBLIQUITY OF ECLIPTIC RIGHT ASCENSION celestial latitude U ECLIPTIC LATITUDE celestial longitude U ECLIPTIC LONGITUDE CELESTIAL MECHANICS RT ALIGNMENT [PLANETS] ANGULAR VELOCITY ASTRODYNAMICS ASTROMETRY ASTRONOMICAL CONSTANTS GRAVITATION GRAVITATIONAL WAVES KEPLERIAN ORBITS LAGRANGIAN POINTS LUNAR THEORY N BODY PROBLEM ORBITAL ELEMENTS ORBITAL EVOLUTION ORBITAL MOTIONS ORBITAL THEORY ORBITS OSCULATORY ELEMENTS PERTURBATION PERTURBATION THEORY PLANETARY THEORY PRECESSION THREE BODY PROBLEM TWO BODY PROBLEM CELESTIAL POLES BT POLES NT NORTH CELESTIAL POLE SOUTH CELESTIAL POLE RT CELESTIAL EQUATOR CELESTIAL SPHERE EQUATOR EQUATORIAL COORDINATE SYSTEM POLAR AXIS CELESTIAL SPHERE RT CELESTIAL EQUATOR CELESTIAL POLES HORIZON ZENITH cells U PHOTOMULTIPLIER TUBES CELSIUS TEMPERATURE SCALE BT TEMPERATURE SCALES RT ABSOLUTE TEMPERATURE SCALE KELVIN TEMPERATURE CENTER Combine with other terms CENTER OF MASS BT ORBITAL ELEMENTS RT BINARY STARS PERICENTER PLANETS CENTRAL STARS RT PLANETARY NEBULAE CENTRIFUGAL FORCE BT FORCE RT CENTRIPETAL FORCE CENTRIPETAL FORCE BT FORCE RT CENTRIFUGAL FORCE cepheid variable stars U CEPHEIDS CEPHEIDS Most commonly used term. UF bump cepheids cepheid variable stars classical cepheids delta cephei stars BT PULSATING VARIABLE STARS NT DOUBLE MODE CEPHEIDS YOUNG DISK CEPHEIDS RT BAADE WESSELINK METHOD BL HERCULIS STARS DWARF CEPHEIDS HE+ IONIZATION ZONE INSTABILITY STRIP KAPPA MECHANISM PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION RADIAL PULSATIONS RADIUS LUMINOSITY RELATION RR LYRAE STARS W VIRGINIS STARS CERENKOV COUNTERS American spelling UF cherenkov counters BT SCINTILLATION COUNTERS RT CERENKOV RADIATION COSMIC RAYS cerenkov effect U CERENKOV RADIATION CERENKOV RADIATION American spelling UF cerenkov effect BT ELECTROMAGNETIC WAVES RADIATION RT CERENKOV COUNTERS COSMIC RAYS GAMMA RAYS NUCLEAR RADIATION RADIATION MECHANISMS ULTRAVIOLET RADIATION cesium clocks U ATOMIC CLOCKS CH Hydrated carbon BT CARBON COMPOUNDS HYDROCARBONS INTERSTELLAR MOLECULES CH STARS BT GIANT STARS RT CARBON STARS CHANDLER WOBBLE UF polar wandering RT EARTH ROTATION LATITUDE DETERMINATION LATITUDE VARIATION POLAR MOTION CHANDRASEKHAR LIMIT RT GRAVITATIONAL COLLAPSE MASS MASS RADIUS RELATION WHITE DWARF STARS CHANDRASEKHAR SCHONBERG LIMIT UF schonberg chandrasekhar limit RT GRAVITATIONAL COLLAPSE HYDROGEN BURNING MASS STELLAR INTERIORS CHARGE COUPLED DEVICES Use abbreviated form (CCD) when combined with other terms. BT PHOTOELECTRONIC DEVICES SEMICONDUCTOR DEVICES RT CCD DETECTORS CCD OBSERVATIONS CCD PHOTOMETRY DETECTORS MULTICHANNEL DETECTORS QUANTUM EFFICIENCY TWO DIMENSIONAL DETECTORS CHARGE INJECTION DEVICES UF cid BT PHOTOELECTRONIC DEVICES SEMICONDUCTOR DEVICES RT DETECTORS TWO DIMENSIONAL DETECTORS CHARGE TRANSFER DEVICES UF ctd BT PHOTOELECTRONIC DEVICES SEMICONDUCTOR DEVICES RT DETECTORS TWO DIMENSIONAL DETECTORS charged particles U ELEMENTARY PARTICLES IONS charts U ATLASES chemical abundance U ABUNDANCE CHEMICAL COMPOSITION RT ABUNDANCE PECULIAR STARS CHEMICAL ELEMENTS See Appendix. NT DEUTERIUM HEAVY ELEMENTS ISOTOPES TRACE ELEMENTS RT ABUNDANCE ATOMS CURVES OF GROWTH ELEMENT FORMATION ORIGIN CHEMICAL EVOLUTION RT ABUNDANCE STELLAR EVOLUTION CHEMILUMINESCENCE BT LUMINESCENCE RT LIGHT EMISSION CHEMISTRY NT COSMOCHEMISTRY cherenkov counters U CERENKOV COUNTERS CHONDRITES BT METEORITES NT ACHONDRITES CARBONACEOUS CHONDRITES CHONDRULES RT AUSTRALITES BEDIASITES MOLDAVITES CHONDRULES BT CHONDRITES CHROMATIC ABERRATION BT ABERRATIONS RT ASTIGMATISM COMA DISTORTION FIELD CURVATURE OPTICAL SYSTEMS SPHERICAL ABERRATION CHROMOSPHERE RT CORONAL LOOPS FACULAE FIBRILLES FILAMENTS [SOLAR] FLASH SPECTRUM MACRO SPICULES MOTTLES PHOTOSPHERE PLAGES PROMINENCES QUIESCENT PROMINENCES SOLAR ATMOSPHERE SPICULES STELLAR ATMOSPHERES STELLAR WINDS SUN TRANSITION REGION chromospheric eruptions U FLARES PROMINENCES chronograph U CHRONOMETERS CHRONOMETERS UF chronograph BT CLOCKS MEASURING INSTRUMENTS RT TIME cid U CHARGE INJECTION DEVICES CIRCULAR ORBITS BT ELLIPTICAL ORBITS RT HYPERBOLIC ORBITS ORBITAL MOTIONS PARABOLIC ORBITS CIRCULAR POLARIZATION BT POLARIZATION [WAVES] RT PLANE POLARIZATION CIRCUMPLANETARY MATTER RT CIRCUMSTELLAR MATTER circumstellar clouds U CIRCUMSTELLAR MATTER CIRCUMSTELLAR DISKS BT DISKS ROTATING BODIES RT ACCRETION DISKS CIRCUMSTELLAR GAS CIRCUMSTELLAR MATTER MASS LOSS TORI CIRCUMSTELLAR DUST BT CIRCUMSTELLAR GRAINS CIRCUMSTELLAR MATTER RT CIRCUMSTELLAR GAS COCOON STARS DUST SHELLS R CORONAE BOREALIS STARS CIRCUMSTELLAR ENVELOPES UF stellar envelopes NT EXPANDING ENVELOPES RT CIRCUMSTELLAR GAS CIRCUMSTELLAR MATTER CIRCUMSTELLAR SHELLS MASS LOSS WOLF RAYET STARS CIRCUMSTELLAR GAS BT CIRCUMSTELLAR MATTER RT CIRCUMSTELLAR DISKS CIRCUMSTELLAR DUST CIRCUMSTELLAR ENVELOPES CIRCUMSTELLAR GRAINS CIRCUMSTELLAR SHELLS CIRCUMSTELLAR GRAINS BT CIRCUMSTELLAR MATTER NT CIRCUMSTELLAR DUST RT CIRCUMSTELLAR GAS R CORONAE BOREALIS STARS CIRCUMSTELLAR MATTER UF circumstellar clouds stellar envelopes NT CIRCUMSTELLAR DUST CIRCUMSTELLAR GAS CIRCUMSTELLAR GRAINS RT BIPOLAR OUTFLOWS CIRCUMPLANETARY MATTER CIRCUMSTELLAR DISKS CIRCUMSTELLAR ENVELOPES CIRCUMSTELLAR SHELLS CORONAS EXPANDING ENVELOPES GRAVITATING DISKS INTERPLANETARY MATTER INTERSTELLAR MATTER MASS LOSS CIRCUMSTELLAR SHELLS UF rotating shells stellar envelopes BT ROTATING BODIES SHELLS NT DUST SHELLS RT Be STARS CIRCUMSTELLAR ENVELOPES CIRCUMSTELLAR GAS CIRCUMSTELLAR MATTER EXTREME CARBON STARS MASS LOSS SHELL STARS STELLAR WINDS CIVIL TIME BT TIME RT EPHEMERIS TIME MEAN SOLAR TIME UNIVERSAL TIME classical cepheids U CEPHEIDS CLASSIFICATION Combine with other terms NT LUMINOSITY CLASSIFICATION SPECTRAL CLASSIFICATION RT MORPHOLOGY NOMENCLATURE TAXONOMY CLEAN METHODS RT DATA PROCESSING IMAGE PROCESSING IMAGE RECONSTRUCTION RADIO ASTRONOMY CLOCKS BT MEASURING INSTRUMENTS TIMING EQUIPMENT NT ATOMIC CLOCKS CHRONOMETERS RT TIME TIME STANDARDS CLOSE BINARY STARS BT BINARY STARS NT AM HERCULIS STARS BETA LYRAE STARS ELLIPSOIDAL VARIABLE STARS SEMIDETACHED BINARY STARS U GEMINORUM STARS Z ANDROMEDAE STARS RT ACCRETION DISKS CONTACT BINARY STARS ROCHE LIMIT ROCHE LOBE SYNCHRONOUS ROTATION TIDAL FRICTION X RAY BRIGHT POINTS CLOSE ENCOUNTERS RT STELLAR DYNAMICS CLOSED UNIVERSE BT COSMOLOGY RT BIG BANG THEORY OPEN UNIVERSE STEADY STATE THEORY CLOUDS Combine with other terms NT COLLAPSING CLOUDS DUST CLOUDS GAS CLOUDS NOCTILUCENT CLOUDS PLASMA CLOUDS RT EARTH ATMOSPHERE clouds of magellan U MAGELLANIC CLOUDS CLUMPING Combine with other terms cluster parallax U MOVING CLUSTER PARALLAX CLUSTER ROTATION RT CLUSTERS CLUSTERS OF GALAXIES STAR CLUSTERS cluster type variable stars U RR LYRAE STARS CLUSTERING Combine with other terms RT CLUSTERS OF GALAXIES STAR CLUSTERS CLUSTERS NT CLUSTERS OF GALAXIES PROTOCLUSTERS STAR CLUSTERS RT CLUSTER ROTATION CLUSTERS OF GALAXIES UF galaxy clustering galaxy clusters BT CLUSTERS NT ABELL CLUSTERS LOCAL SUPERCLUSTER RT CLUSTER ROTATION CLUSTERING D GALAXIES GALAXY COUNTS GALAXY DISTRIBUTION GALAXY MERGERS GREAT ATTRACTOR INTERGALACTIC MATTER INTRACLUSTER MATTER LUMINOSITY FUNCTION MASSIVE GALAXIES MISSING MASS MULTIPLE GALAXIES PROTOCLUSTERS RELAXATION TIME SUNYAEV ZELDOVICH EFFECT SUPERCLUSTERS VELOCITY DISPERSION VELOCITY DISTRIBUTION VIRIAL THEOREM clusters of stars U STAR CLUSTERS cn U CYANOGEN CN STARS Carbon-nitrogen stars. BT GIANT STARS RT CARBON STARS cno U CARBON NITROGEN CYCLE CNO ANOMALIES RT ABUNDANCE ABUNDANCE RATIOS CARBON NITROGEN CYCLE METAL ABUNDANCE cno cycle U CARBON NITROGEN CYCLE co U CARBON MONOXIDE COATINGS Combine with other terms NT ALUMINUM COATINGS ANTIREFLECTION COATINGS SILVER COATINGS RT LENSES MIRRORS THIN FILMS VAPOR DEPOSITION cobalt stars U MAGNETIC STARS COCOON STARS BT INFRARED SOURCES RT CIRCUMSTELLAR DUST COELOSTATS BT REFLECTING TELESCOPES NT HELIOSTATS RT DRIVES SIDEROSTATS TELESCOPE MOUNTINGS COHERENCE Combine with other terms NT LIGHT COHERENCE RT LASERS MASERS COLD DARK MATTER BT DARK MATTER RT BARYONIC DARK MATTER COSMOLOGY COLLAPSE Combine with other terms NT GRAVITATIONAL COLLAPSE collapsed objects U COLLAPSED STARS COLLAPSED STARS UF collapsed objects collapsing stars NT BLACK HOLES NEUTRON STARS PULSARS WHITE DWARF STARS RT DEGENERATE STARS STELLAR EVOLUTION COLLAPSING CLOUDS BT CLOUDS NT PROTOPLANETARY NEBULAS RT PROTOCLUSTERS PROTOGALAXIES PROTOSTARS collapsing stars U COLLAPSED STARS COLLIMATION RT ADJUSTMENT ALIGNMENT [OPTICS] CORRECTIONS OPTICS ORIENTATION COLLIMATORS RT BEAM WAVEGUIDES LENSES MIRRORS OPTICAL INSTRUMENTS COLLISION BROADENING BT COLLISION PROCESSES LINE BROADENING RT COLLISION SPECTROSCOPY COLLISION STRENGTHS COLLISIONAL EXCITATION SPECTROSCOPIC ANALYSIS COLLISION PROCESSES NT COLLISION BROADENING COLLISIONAL EXCITATION RT COLLISION STRENGTHS COLLISIONAL PLASMAS COLLISION SPECTROSCOPY BT SPECTROSCOPY RT COLLISION BROADENING COLLISION STRENGTHS COLLISIONAL EXCITATION COLLISION STRENGTHS RT COLLISION BROADENING COLLISION PROCESSES COLLISION SPECTROSCOPY COLLISIONAL EXCITATION COLLISIONAL EXCITATION BT COLLISION PROCESSES RT COLLISION BROADENING COLLISION SPECTROSCOPY COLLISION STRENGTHS IONIZED GASES IONS SPECTROSCOPY COLLISIONAL PLASMAS BT PLASMAS RT COLLISION PROCESSES IONS SHOCKS COLLISIONS Combine with other terms RT GALAXIES METEORITES PLANETS COLOR BT OPTICAL PROPERTIES RT COLOR EQUATION COLOR EXCESSES COLOR LUMINOSITY RELATION COLOR MAGNITUDE RELATION COLOR PHOTOGRAPHY COLOR REDSHIFT RELATION COLORIMETRY LIGHT PHOTOMETRY SPECTROPHOTOMETRY TEMPERATURE COLOR EQUATION RT COLOR PHOTOMETRY COLOR EXCESSES RT COLOR INTERSTELLAR REDDENING PHOTOMETRY color filters U OPTICAL FILTERS COLOR INDICES RT INTRINSIC COLORS PHOTOMETRY TWO COLOR DIAGRAMS COLOR LUMINOSITY RELATION RT COLOR HERTZSPRUNG RUSSELL DIAGRAM PHOTOMETRY COLOR MAGNITUDE RELATION UF c m diagrams c m relation RT COLOR HERTZSPRUNG RUSSELL DIAGRAM PHOTOMETRY COLOR PHOTOGRAPHY BT PHOTOGRAPHY RT COLOR COLOR REDSHIFT RELATION RT COLOR COSMOLOGY OBSERVATIONAL COSMOLOGY COLOR VISION BT VISION RT DARK ADAPTION COLORIMETRY RT COLOR COMA BT ABERRATIONS RT ASTIGMATISM CHROMATIC ABERRATION DISTORTION FIELD CURVATURE OPTICAL SYSTEMS SPHERICAL ABERRATION COMAS RT COMETS GALAXIES COMETS Named comets not included. NT APERIODIC COMETS KREUTZ SUNGRAZERS LONG PERIOD COMETS PERIODIC COMETS RT COMAS DIRTY SNOWBALL THEORY DUST ENVELOPES HALOS INTERPLANETARY MATTER JETS METEOR STREAMS METEORITES METEOROID DUST CLOUD METEOROIDS NUCLEI [CELESTIAL OBJECTS] OORT CLOUD PARABOLIC ORBITS SOLAR SYSTEM STREAMERS TAILS COMPACT GALAXIES BT PECULIAR GALAXIES RT ACTIVE GALAXIES BL LACERTAE OBJECTS N GALAXIES QUASARS COMPACT H II REGIONS BT H II REGIONS COMPACT NEBULAE BT NEBULAE COMPACT NUCLEI BT GALACTIC NUCLEI NUCLEI [CELESTIAL OBJECTS] NT SEYFERT NUCLEI RT ACTIVE GALACTIC NUCLEI COMPACT SOURCES SEYFERT GALAXIES COMPACT OBJECTS NT BL LACERTAE OBJECTS BLACK HOLES COMPACT SOURCES NEUTRON STARS WHITE DWARF STARS COMPACT SOURCES BT COMPACT OBJECTS RADIO SOURCES RT COMPACT NUCLEI RADIO STRUCTURE COMPANION GALAXIES BT GALAXIES RT DOUBLE GALAXIES GROUPS OF GALAXIES COMPANION STARS RT BINARY STARS MULTIPLE STARS COMPARISON Combine with other terms COMPARISON STARS RT STANDARD STARS VARIABLE STARS COMPONENTS Combine with other terms COMPOSITE PARTICLES BT BOSONS NT ALPHA PARTICLES IONS RADICALS COMPOSITION Combine with other terms RT PLANETS COMPTON EFFECT RT ELECTRONS RADIATION SCATTERING X RAY SCATTERING COMPTON SCATTERING BT LIGHT SCATTERING RADIATION SCATTERING SCATTERING NT THOMSON SCATTERING RT ELECTRONS INVERSE COMPTON SCATTERING RAYLEIGH SCATTERING COMPUTER APPLICATIONS NT COMPUTER SIMULATIONS COMPUTER MODELS UF mathematical models BT MODELS RT COMPUTER PROGRAMS COMPUTER SIMULATIONS NUMERICAL SIMULATION COMPUTER PROGRAMS RT COMPUTER MODELS COMPUTER SIMULATIONS DATA PROCESSING COMPUTER SIMULATIONS UF computerized simulations BT COMPUTER APPLICATIONS SIMULATION RT COMPUTER MODELS COMPUTER PROGRAMS computerized simulations U COMPUTER SIMULATIONS COMPUTERS NT MICROPROCESSORS RT CONTROL SYSTEMS DATA CENTERS DATA PROCESSING DATA REDUCTION DATA STORAGE NEW TECHNOLOGY TELESCOPES PERIPHERALS COMPUTING Combine with other terms CONDENSATION Combine with other terms CONDUCTION Combine with other terms RT ENERGY TRANSFER THERMAL CONDUCTIVITY CONJUNCTION Refers to planet positions. RT OPPOSITION QUADRATURE SYNODIC PERIOD SYZYGY CONSTANTS NT ASTRONOMICAL CONSTANTS COSMOLOGICAL CONSTANT GRAVITATIONAL CONSTANT CONSTELLATIONS See Appendix. RT ASTROLOGY ZODIAC CONTACT BINARY STARS BT BINARY STARS NT BETA LYRAE STARS ELLIPSOIDAL VARIABLE STARS RT CLOSE BINARY STARS ECLIPSING BINARY STARS EQUIPOTENTIAL SURFACES MASS EXCHANGE CONTENT OF GALAXIES RT GALAXIES INTERSTELLAR MATTER CONTINENTAL DRIFT RT CONTINENTS GEOMAGNETISM GEOPHYSICS PALEOMAGNETISM CONTINENTS RT CONTINENTAL DRIFT EARTH CONTINUA Combine with other terms RT CONTINUUM RADIATION SPECTRA CONTINUOUS SPECTRA BT SPECTRA RT LIGHT EMISSION SPECTROSCOPIC ANALYSIS SPECTROSCOPY VISIBLE SPECTRUM CONTINUUM RADIATION BT RADIATION NT ULTRAVIOLET CONTINUUM X RAY CONTINUUM RT CONTINUA PHOTOSPHERE CONTOUR MAPS BT MAPS RT ISOPHOTES RADIO STRUCTURE CONTRACTION Combine with other terms CONTRAST Combine with other terms CONTROL SYSTEMS NT AUTOGUIDERS REMOTE CONTROL SYSTEMS RT COMPUTERS DRIVES GUIDE SYSTEMS MICROPROCESSORS NEW TECHNOLOGY TELESCOPES POINTING ACCURACY POINTING ERRORS QUADRANT DETECTORS TELESCOPE INSTRUMENTATION TELESCOPES TRACKING CONVECTION RT CONVECTIVE ENVELOPES CONVECTIVE SHELLS CONVECTIVE ZONES DREDGE UP ENERGY TRANSFER ENVELOPES GRANULATION HAYASHI TRACK LINE BROADENING MASS TRANSFER RAYLEIGH NUMBER THERMAL INSTABILITY THERMAL STRUCTURE TURBULENCE [EARTH ATMOSPHERE] TURBULENCE [STAR ATMOSPHERE] CONVECTIVE ENVELOPES RT CONVECTION CONVECTIVE SHELLS BT SHELLS RT CONVECTION CONVECTIVE ZONES RT CONVECTION cool dwarf stars U LATE TYPE DWARF STARS cool giant stars U LATE TYPE GIANT STARS cool stars U LATE TYPE STARS cool subdwarf stars U LATE TYPE SUBDWARF STARS cool supergiant stars U LATE TYPE SUPERGIANT STARS COOLING Combine with other terms COOLING FLOWS RT ACCRETION DISKS GALAXIES STAR FORMATION COORDINATE SYSTEMS Planet and satellite surface coordinates not included. NT ECLIPTIC COORDINATE SYSTEM EQUATORIAL COORDINATE SYSTEM GALACTIC COORDINATE SYSTEM HORIZON COORDINATE SYSTEM RT ABERRATION ASTROMETRY HELIOCENTRIC CORRECTION POSITIONS REFERENCE FRAMES REFERENCE SYSTEMS SPHERICAL COORDINATES TRUE POSITIONS CORES Combine with other terms RT EARTH PLANETS STELLAR INTERIORS CORONAGRAPHS BT INSTRUMENTATION OPTICAL INSTRUMENTS RT CAMERAS SOLAR CORONA SOLAR OBSERVATORIES SPECTROHELIOGRAPHS CORONAL HOLES BT CORONAS RT SOLAR CORONA SOLAR WIND CORONAL LINES BT CORONAS EMISSION LINES RT SOLAR CORONA CORONAL LOOPS BT CORONAS RT CHROMOSPHERE SOLAR ACTIVITY SOLAR CORONA CORONAL MASS EJECTIONS RT CORPUSCULAR EMISSIONS MASS LOSS SOLAR CORONA CORONAL PLUMES BT CORONAS RT SOLAR CORONA CORONAL TRANSIENTS RT SOLAR CORONA CORONAS NT CORONAL HOLES CORONAL LINES CORONAL LOOPS CORONAL PLUMES E CORONA F CORONA K CORONA SOLAR CORONA RT CIRCUMSTELLAR MATTER HALOS IONIZATION MASS LOSS STELLAR ATMOSPHERES CORPUSCULAR EMISSIONS RT CORONAL MASS EJECTIONS correcting lenses U FIELD CORRECTORS CORRECTIONS Combine with other terms RT ADJUSTMENT ALIGNMENT [OPTICS] COLLIMATION ERRORS SELECTION EFFECTS CORRECTOR PLATES BT LENSES OPTICAL COMPONENTS RT CATADIOPTRIC SYSTEMS FIELD CORRECTORS SCHMIDT CAMERAS SCHMIDT TELESCOPES CORRELATION Combine with other terms NT CROSS CORRELATION RT INTERFEROMETRY RECEIVERS COSMIC Combine with other terms COSMIC ABUNDANCE BT ABUNDANCE RT COSMOLOGY cosmic background radiation U BACKGROUND RADIATION cosmic chemistry U COSMOCHEMISTRY cosmic dust U DUST COSMIC ELECTRODYNAMICS BT ELECTRODYNAMICS ELECTROMAGNETIC THEORY RT MAGNETOHYDRODYNAMICS cosmic gamma ray bursts U GAMMA RAY BURSTS COSMIC NOISE BT NOISE RADIO INTERFERENCE NT MICROWAVE BACKGROUND RT BACKGROUND NOISE BACKGROUND RADIATION MICROWAVE EMISSION RADIO BACKGROUND cosmic plasmas U PLASMAS cosmic radiation U COSMIC RAYS COSMIC RAY ASTRONOMY RT BALLOON BORNE INSTRUMENTS HIGH ENERGY ASTROPHYSICS ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS COSMIC RAY SHOWERS UF air showers auger showers cascade showers RT COSMIC RAYS PHOSPHORESCENT SCINTILLATION SECONDARY COSMIC RAYS COSMIC RAY SOURCES RT COSMIC RAYS COSMIC RAYS UF cosmic radiation galactic cosmic rays primary cosmic rays BT BACKGROUND RADIATION HIGH ENERGY RADIATION RADIATION RT CERENKOV COUNTERS CERENKOV RADIATION COSMIC RAY SHOWERS COSMIC RAY SOURCES FORBUSH EFFECT INVERSE COMPTON EFFECT SECONDARY COSMIC RAYS COSMIC STRINGS UF strings RT COSMOLOGY INTERGALACTIC MATTER INTERSTELLAR MATTER LARGE SCALE STRUCTURE COSMIC YEAR BT YEAR RT GALACTIC ROTATION cosmobiology U SPACE BIOLOGY COSMOCHEMISTRY UF astrochemistry cosmic chemistry BT CHEMISTRY RT COSMOLOGY EXOBIOLOGY EXTRATERRESTRIAL MATTER INTERSTELLAR MOLECULES MOLECULAR ASTROPHYSICS COSMOGONY BT ASTRONOMY NT RELATIVITY RT COSMOLOGY PROTOCLUSTERS PROTOGALAXIES PROTOPLANETARY NEBULAS UNIVERSE COSMOLOGICAL CONSTANT BT CONSTANTS RT COSMOLOGICAL DISTANCE SCALE COSMOLOGY COSMOLOGICAL DISTANCE SCALE BT DISTANCE SCALE RT COSMOLOGICAL CONSTANT DECELERATION PARAMETER HUBBLE CONSTANT OBSERVATIONAL COSMOLOGY REDSHIFT REDSHIFT DISTANCE RELATION REDSHIFT MAGNITUDE RELATION COSMOLOGICAL MODELS See under COSMOLOGY COSMOLOGY BT ASTRONOMY NT BIANCHI COSMOLOGY BIG BANG THEORY CLOSED UNIVERSE DE SITTER UNIVERSE DIRAC COSMOLOGY EINSTEIN UNIVERSE EXPANDING UNIVERSE FRIEDMANN UNIVERSE GOEDEL UNIVERSE HIERARCHICAL COSMOLOGY INFLATIONARY UNIVERSE LEMAITRE UNIVERSE OPEN UNIVERSE OSCILLATING UNIVERSE PRIMORDIAL FIREBALL QUANTUM COSMOLOGY RELATIVISTIC COSMOLOGY STEADY STATE THEORY RT ANTHROPIC PRINCIPLE ASTROPHYSICS COLD DARK MATTER COLOR REDSHIFT RELATION COSMIC ABUNDANCE COSMIC STRINGS COSMOCHEMISTRY COSMOGONY COSMOLOGICAL CONSTANT CURVATURE OF SPACE TIME DARK MATTER EARLY UNIVERSE GALAXY COUNTS GALAXY DISTRIBUTION GALAXY EVOLUTION GENERAL THEORY OF RELATIVITY HUBBLE CONSTANT HUBBLE DIAGRAM HUBBLE LAW HUBBLE RADIUS HUBBLE TIME MISSING MASS PROTOCLUSTERS PROTOGALAXIES REDSHIFT REDSHIFT DISTANCE RELATION REDSHIFT MAGNITUDE RELATION RELATIVISTIC ASTROPHYSICS RELATIVISTIC VELOCITY STELLAR EVOLUTION TULLY FISHER RELATION UNIVERSE WHITE HOLES cosmos U UNIVERSE COUDE FOCUS BT FOCUS RT CASSEGRAIN FOCUS NASMYTH FOCUS NEWTONIAN FOCUS PRIME FOCUS COUDE SPECTRA BT HIGH RESOLUTION SPECTRA RT ECHELLE SPECTROGRAPHS COUDE SPECTROGRAPHS BT SPECTROGRAPHS RT HIGH RESOLUTION SPECTRA HIGH RESOLUTION SPECTROSOPY counterglow U GEGENSCHEIN COUNTERS UF counts BT MEASURING INSTRUMENTS NT SCINTILLATION COUNTERS RT COUNTING DATA ACQUISITION PHOTON COUNTING SYSTEMS COUNTING UF counts RT COUNTERS DATA ACQUISITION counts U COUNTERS COUNTING COUPLING Combine with other terms CRATERS Combine with other terms NT IMPACT CRATERS RT BASINS EARTH EJECTA METEORS MOON PLANETS VOLCANOES CROSS CORRELATION BT CORRELATION RT DATA PROCESSING CRUST Combine with other terms RT CRUSTAL DYNAMICS EARTH MANTLES MOON PLANETS CRUSTAL DYNAMICS RT CRUST MANTLES MOON CRYOGENICS RT CRYOSTATS OUTGASSING TEMPERATURE CONTROL CRYOSTATS RT CRYOGENICS TEMPERATURE CONTROL cs stars U GIANT STARS ctd U CHARGE TRANSFER DEVICES CURRENT SHEETS RT ANTENNAS CURRENTS ELECTRIC CURRENTS CURRENTS Combine with other terms RT ANTENNAS CURRENT SHEETS ELECTRIC CURRENTS curvature of field U FIELD CURVATURE CURVATURE OF SPACE TIME RT COSMOLOGY GENERAL THEORY OF RELATIVITY CURVES OF GROWTH RT ABUNDANCE CHEMICAL ELEMENTS CYANOACETYLENE BT CARBON COMPOUNDS CYANODIACETYLENE BT CARBON COMPOUNDS CYANOGEN UF cn BT CARBON COMPOUNDS CYANOGEN LINES RT ABSORPTION LINES CYANOPOLYYNES BT CARBON COMPOUNDS CYCLE RT PERIOD CYCLOTRON RADIATION BT RADIATION SYNCHROTRON RADIATION RT RADIATION MECHANISMS D GALAXIES BT GALAXIES NT cD GALAXIES RT CLUSTERS OF GALAXIES MASSIVE GALAXIES D LAYER UF d region RT EARTH ATMOSPHERE IONOSPHERE D LINES RT ABSORPTION SPECTRA d region U D LAYER da stars U WHITE DWARF STARS DAMPING CONSTANTS RT LINE FORMATION RADIATION DAMPING RADIATIVE BRAKING DANJON ASTROLABES BT ASTROLABES DARK ADAPTION UF retinal adaption RT COLOR VISION DARKNESS NIGHT VISION VISION DARK CLOUDS BT INTERSTELLAR MATTER RT C II REGIONS dark current U THERMIONIC EMISSION DARK MATTER BT INTERGALACTIC MATTER INTERSTELLAR MATTER NT COLD DARK MATTER RT COSMOLOGY ELEMENTARY PARTICLES DARK NEBULAE UF absorption nebulae BT INTERSTELLAR MATTER NEBULAE NT BOK GLOBULES RT GLOBULES STAR FORMATION WOLF DIAGRAM DARKNESS RT DARK ADAPTION DIURNAL VARIATIONS LIGHT OPTICAL PROPERTIES DARKROOMS RT PHOTOGRAPHIC PROCESSING PHOTOGRAPHY DATA ACQUISITION RT COUNTERS COUNTING DATA ANALYSIS DIGITAL RECORDERS OBSERVATIONS OBSERVING TECHNIQUES DATA ANALYSIS BT ANALYSES RT DATA ACQUISITION DATA PROCESSING DATA REDUCTION DATA STORAGE DETERMINATION DATA BASES RT DATA CENTERS DATA RETRIEVAL DATA STORAGE DATA CENTERS RT COMPUTERS DATA BASES DATA PROCESSING DATA REDUCTION DATA RETRIEVAL DATA STORAGE ON LINE SYSTEMS DATA PROCESSING NT DATA REDUCTION MONTE CARLO TECHNIQUES NUMERICAL ANALYSIS RT CLEAN METHODS COMPUTER PROGRAMS COMPUTERS CROSS CORRELATION DATA ANALYSIS DATA CENTERS DATA RETRIEVAL DATA STORAGE ERROR ANALYSIS OBSERVING TECHNIQUES ON LINE SYSTEMS REDUCTION METHODS DATA REDUCTION BT DATA PROCESSING RT COMPUTERS DATA ANALYSIS DATA CENTERS DATA RETRIEVAL DATA STORAGE ERROR ANALYSIS FINE ANALYSES REDUCTION METHODS DATA RETRIEVAL RT DATA BASES DATA CENTERS DATA PROCESSING DATA REDUCTION DATA STORAGE DATA STORAGE RT ANALOG RECORDERS COMPUTERS DATA ANALYSIS DATA BASES DATA CENTERS DATA PROCESSING DATA REDUCTION DATA RETRIEVAL dayglow U AIRGLOW DDO PHOTOMETRY BT MEDIUM BAND PHOTOMETRY PHOTOMETRIC SYSTEMS DE SITTER UNIVERSE BT COSMOLOGY debris U SPACE DEBRIS DECAY [OSCILLATIONS] Of oscillations RT AMPLITUDES OSCILLATIONS RADIATION DAMPING DECAY [RADIOACTIVE] In radioactivity. RT RADIOACTIVITY DECELERATION RT ACCELERATION DECELERATION PARAMETER DECELERATION PARAMETER RT COSMOLOGICAL DISTANCE SCALE DECELERATION DECLINATION RT CELESTIAL EQUATOR EQUATOR EQUATORIAL COORDINATE SYSTEM EQUATORIAL ZONES RIGHT ASCENSION DECONVOLUTION Combine with other terms DEFECTS Combine with other terms DEFORMATION Combine with other terms DEGENERATE DWARF STARS BT DEGENERATE STARS NT WHITE DWARF STARS DEGENERATE MATTER NT BLACK HOLES DEGENERATE STARS DEGENERATE STARS BT DEGENERATE MATTER SUBLUMINOUS STARS NT DEGENERATE DWARF STARS NEUTRON STARS PULSARS RT COLLAPSED STARS MASS RADIUS RELATION delta cephei stars U CEPHEIDS DELTA DELPHINI STARS BT DELTA SCUTI STARS PULSATING VARIABLE STARS DELTA SCUTI STARS UF ai velorum stars ultra short period variable stars BT MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS SHORT PERIOD VARIABLE STARS NT DELTA DELPHINI STARS RT DWARF CEPHEIDS HE+ IONIZATION ZONE KAPPA MECHANISM NONRADIAL PULSATIONS RADIAL PULSATIONS DENSE CLOUDS BT INTERSTELLAR MATTER NEBULAE RT DENSE MATTER DENSE MATTER BT INTERSTELLAR MATTER NEBULAE RT DENSE CLOUDS DENSITOMETERS BT MEASURING INSTRUMENTS RT DENSITOMETRY MICRODENSITOMETERS DENSITOMETRY RT DENSITOMETERS DENSITY UF specific gravity NT ATMOSPHERIC DENSITY ELECTRON DENSITY GAS DENSITY MASS DENSITY RT DENSITY BOUNDED DENSITY DISTRIBUTION DENSITY FLUCTUATIONS DENSITY PERTURBATION DENSITY VARIATIONS DENSITY WAVE MODEL RANKINE HUGONIOT RELATIONS DENSITY BOUNDED RT DENSITY DENSITY DISTRIBUTION RT DENSITY DENSITY FLUCTUATIONS RT DENSITY DENSITY PERTURBATION RT DENSITY DENSITY VARIATIONS RT DENSITY DENSITY WAVE MODEL RT DENSITY descending nodes U NODES DESIGN Combine with other terms RT ENGINEERING RESEARCH DESTRUCTION Combine with other terms DETACHED BINARY STARS BT BINARY STARS NT W URSAE MAJORIS STARS RT SEMIDETACHED BINARY STARS DETECTION Combine with other terms NT SIGNAL DETECTION DETECTOR ARRAYS BT ARRAYS RT ARRAY PROCESSORS DETECTORS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. BT INSTRUMENTATION NT DUST DETECTORS INFRARED DETECTORS MULTICHANNEL DETECTORS PHOTOGRAPHIC EMULSIONS PHOTOMULTIPLIER TUBES RADIOMETERS SYNCHRONOUS DETECTORS TWO DIMENSIONAL DETECTORS ULTRAVIOLET DETECTORS X RAY DETECTORS RT CHARGE COUPLED DEVICES CHARGE INJECTION DEVICES CHARGE TRANSFER DEVICES LIMITING MAGNITUDES PIXEL QUANTUM EFFICIENCY RECEIVERS REMOTE SENSING SEMICONDUCTOR DEVICES SENSITIVITY SHOT NOISE SIGNAL DETECTION TELESCOPE INSTRUMENTATION DETERMINATION RT DATA ANALYSIS MEASUREMENT QUANTIZATION DEUTERIUM Isotope of hydrogen. BT CHEMICAL ELEMENTS DIAGRAMS Combine with other terms DIAMETERS Combine with other terms BT DIMENSIONS NT ANGULAR DIAMETERS RT BAADE WESSELINK METHOD OCCULTATIONS SURFACE GRAVITY DIAMOND RING EFFECT RT BAILYS BEADS SOLAR ECLIPSE SUN DICHROIC MIRRORS BT MIRRORS RT OPTICAL FILMS OPTICAL FILTERS DICKE RADIOMETERS DIFFERENTIAL EQUATIONS BT MATHEMATICAL ANALYSIS DIFFERENTIAL ROTATION BT ROTATION RT GALAXIES GLOBULAR STAR CLUSTERS TIDAL DISRUPTION TIDAL DISTORTION DIFFRACTION NT X RAY DIFFRACTION RT AIRY DISKS DIFFRACTION PATTERNS INTERFERENCE [WAVES] RAYLEIGH CRITERION SHADOW BANDS DIFFRACTION GRATINGS UF gratings BT OPTICAL COMPONENTS NT ECHELLE GRATINGS OBJECTIVE GRATINGS REFLECTION GRATINGS TRANSMISSION GRATINGS RT GRATING SPECTROGRAPHS GRISMS SPECTRA SPECTROGRAPHS DIFFRACTION PATTERNS RT DIFFRACTION DIFFUSE NEBULAE BT NEBULAE DIFFUSE RADIATION Combine with other terms DIFFUSION Combine with other terms DIGITAL IMAGES BT IMAGES DIGITAL RECORDERS RT DATA ACQUISITION DIMENSIONS Combine with other terms NT DIAMETERS DIODE ARRAYS BT ARRAYS MULTICHANNEL DETECTORS RT RETICON ARRAYS DIODES BT ELECTRONIC EQUIPMENT DIOPTRIC SYSTEMS RT LENSES OPTICAL TELESCOPES DIPOLE ANTENNAS BT ANTENNAS DIRECTIONAL ANTENNAS RT DIPOLES DIPOLES NT HALF WAVE DIPOLES RT DIPOLE ANTENNAS ELECTRIC CHARGE ELECTRIC DIPOLES DIRAC COSMOLOGY BT COSMOLOGY DIRECTIONAL ANTENNAS NT DIPOLE ANTENNAS MILLS CROSS ANTENNAS PARABOLIC ANTENNAS YAGI ANTENNAS DIRTY SNOWBALL THEORY RT COMETS NUCLEI [CELESTIAL OBJECTS] DISCOLORATION Combine with other terms DISCOVERIES Combine with other terms RT RESEARCH SPACE EXPLORATION DISCRETE RADIO SOURCES BT RADIO SOURCES DISH ANTENNAS BT RADIO TELESCOPES RT ANTENNAS PARABOLIC REFLECTORS RADAR TELESCOPES DISINTEGRATION Combine with other terms DISK GALAXIES RT DISKS DISK POPULATION BT POPULATION II STARS RT DISKS GALACTIC PLANE STELLAR POPULATIONS DISK STARS BT POPULATION II STARS RT DISKS GALACTIC PLANE GASEOUS DISKS DISKS NT ACCRETION DISKS CIRCUMSTELLAR DISKS GASEOUS DISKS GRAVITATING DISKS RT DISK GALAXIES DISK POPULATION DISK STARS DISPERSION Combine with other terms DISRUPTION Combine with other terms DISSIPATION Combine with other terms DISTANCE RT ABSOLUTE MAGNITUDE BODES LAW DISTANCE INDICATORS DISTANCE MEASUREMENT DISTANCE MODULUS DISTANCE SCALE LIGHT YEAR PARALLAXES PARSEC RANGE FINDERS TRIGONOMETRIC PARALLAX DISTANCE INDICATORS RT DISTANCE DISTANCE MEASUREMENT DISTANCE MODULUS DISTANCE SCALE DISTANCE MEASUREMENT RT DISTANCE DISTANCE INDICATORS DISTANCE SCALE DISTANCE MODULUS UF modulus RT ABSOLUTE MAGNITUDE DISTANCE DISTANCE INDICATORS DISTANCE SCALE PARALLAXES DISTANCE SCALE NT COSMOLOGICAL DISTANCE SCALE RT ASTRONOMICAL UNIT DISTANCE DISTANCE INDICATORS DISTANCE MEASUREMENT DISTANCE MODULUS PARSEC DISTORTION BT ABERRATIONS RT ASTIGMATISM CHROMATIC ABERRATION COMA FIELD CURVATURE OPTICAL SYSTEMS SPHERICAL ABERRATION DISTRIBUTION FUNCTION In mathematics. BT FUNCTIONS RT DISTRIBUTION IN SPACE FREQUENCY DISTRIBUTION STATISTICS DISTRIBUTION IN SPACE Combine with other terms RT DISTRIBUTION FUNCTION DIURNAL PARALLAX BT PARALLAXES NT HORIZONTAL PARALLAX RT ZENITH DISTANCE DIURNAL PHENOMENA RT DIURNAL VARIATIONS DIURNAL VARIATIONS RT DARKNESS DIURNAL PHENOMENA DOME SEEING BT SEEING RT DOMES VENTILATION DOMES Excluding LUNAR DOMES UF telescope domes RT DOME SEEING OBSERVATORIES TELESCOPES TEMPERATURE CONTROL VENTILATION DOPPLER BROADENING BT LINE BROADENING RT DOPPLER EFFECT LINE WIDTHS NATURAL LINE WIDTH PRESSURE BROADENING STARK BROADENING ZEEMAN SPLITTING DOPPLER EFFECT NT BLUE SHIFT REDSHIFT RT DOPPLER BROADENING LINE SHIFT RADAR RADIAL VELOCITY SPECTROSCOPIC ANALYSIS SPECTROSCOPIC BINARY STARS STELLAR MOTIONS DOUBLE GALAXIES UF binary galaxies binary systems BT GALAXIES RT COMPANION GALAXIES GALAXY MERGERS DOUBLE MODE CEPHEIDS UF beat cepheids BT CEPHEIDS DOUBLE MODE VARIABLE STARS PULSATING VARIABLE STARS RT DOUBLE MODE PULSATION DOUBLE MODE PULSATION BT MULTIPERIODIC PULSATION RT DOUBLE MODE CEPHEIDS DOUBLE MODE VARIABLE STARS PULSATING VARIABLE STARS DOUBLE MODE VARIABLE STARS BT MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS NT DOUBLE MODE CEPHEIDS RR LYRAE STARS RT DOUBLE MODE PULSATION DOUBLE QUASARS RT GRAVITATIONAL DEFLECTION GRAVITATIONAL LENSES QUASARS double stars U BINARY STARS DQ HERCULIS STARS BT ECLIPSING BINARY STARS SLOW NOVAS DREDGE UP RT CONVECTION GIANT STARS METAL ABUNDANCE STELLAR ATMOSPHERES STELLAR INTERIORS DRIFT SCANS RT PHOTOMETRY RADIO STRUCTURE SURFACE PHOTOMETRY DRIFT WAVES BT WAVES DRIVES RT COELOSTATS CONTROL SYSTEMS SIDEROSTATS TELESCOPES DUST UF cosmic dust BT INTERGALACTIC MATTER INTERSTELLAR MATTER NT INTERPLANETARY DUST INTERSTELLAR DUST ZODIACAL DUST RT COMETS DUST CLOUDS DUST DETECTORS DUST GRAINS DUST NEBULAE DUST SHELLS DUST STORMS GAS TO DUST RATIO DUST CLOUDS BT CLOUDS INTERSTELLAR MATTER RT DUST INTERSTELLAR DUST DUST DETECTORS BT DETECTORS RT DUST DUST GRAINS BT INTERSTELLAR MATTER RT ADSORPTION DUST DUST NEBULAE BT INTERSTELLAR MATTER NEBULAE RT DUST DUST SHELLS BT CIRCUMSTELLAR SHELLS SHELLS RT CIRCUMSTELLAR DUST DUST SYMBIOTIC STARS DUST STORMS RT DUST PLANETS SURFACES [CELESTIAL BODIES] DWARF CEPHEIDS BT IRREGULAR VARIABLE STARS MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS RT CEPHEIDS DELTA SCUTI STARS DWARF GALAXIES BT GALAXIES PECULIAR GALAXIES dwarf novas U U GEMINORUM STARS DWARF STARS The term alone refers to mainsequence stars, but subterms may refer to evolved stars. BT MAINSEQUENCE STARS NT A DWARF STARS B DWARF STARS BLACK DWARF STARS BROWN DWARF STARS F DWARF STARS FLARE STARS G DWARF STARS K DWARF STARS LATE TYPE DWARF STARS M DWARF STARS NEARBY DWARF STARS O DWARF STARS RT LOW LUMINOSITY STARS LOW MASS STARS LUMINOSITY CLASSIFICATION MAINSEQUENCE SUBDWARF STARS DYNAMICAL EVOLUTION BT EVOLUTION DYNAMICAL FRICTION BT FRICTION RT RADIATIVE BRAKING DYNAMICAL PARALLAX BT PARALLAXES RT BINARY STARS KINEMATIC PARALLAX MOVING CLUSTER PARALLAX DYNAMICAL TIME BT TIME DYNAMICS Combine with other terms DYNAMO THEORY RT MAGNETIC FIELDS e component U E CORONA E CORONA UF e component BT CORONAS e FOLDING TIME RT OSCILLATIONS E galaxies U ELLIPTICAL GALAXIES E LAYER Refers to earth atmosphere. UF E region RT EARTH ATMOSPHERE IONOSPHERE e PROCESS RT NUCLEAR FUSION STELLAR EVOLUTION SUPERNOVAS E region Refers to earth atmosphere. U E LAYER E REGIONS BT KAPTEYN SELECTED AREAS RT JOHNSON PHOTOMETRY PHOTOMETRY STROMGREN PHOTOMETRY early stage stars U PREMAINSEQUENCE STARS EARLY TYPE EMISSION STARS BT EMISSION LINE STARS NT Ae STARS Be STARS Oe STARS Oef STARS Of STARS WOLF RAYET STARS EARLY TYPE GALAXIES BT GALAXIES EARLY TYPE STARS UF blue stars hot stars BT ULTRAVIOLET SOURCES NT A STARS B STARS EARLY TYPE VARIABLE STARS FAINT BLUE STARS O STARS OB STARS RT Oef STARS ORION POPULATION STARS EARLY TYPE SUPERGIANT STARS BT SUPERGIANT STARS NT A SUPERGIANT STARS B SUPERGIANT STARS O SUPERGIANT STARS OB SUPERGIANT STARS RT LUMINOUS BLUE VARIABLE STARS EARLY TYPE VARIABLE STARS BT EARLY TYPE STARS NT BETA CEPHEI STARS LUMINOUS BLUE VARIABLE STARS S DORADUS STARS SX ARIETIS STARS RT A STARS B STARS O STARS EARLY UNIVERSE RT BIG BANG THEORY COSMOLOGY EARTH Combine with other terms BT PLANETS RT CONTINENTS CORES CRATERS CRUST EARTH SCIENCES EARTHQUAKES GEOCORONA GEODESY GEOID GEOMAGNETISM GEOPHYSICS GLACIOLOGY MANTLES PERIGEE POLAR CAPS RADIATION BELTS SCINTILLATION SEISMOLOGY SIDEREAL TIME SOLAR SYSTEM SOLAR TERRESTRIAL RELATIONS SPACE GEODESY TOPOGRAPHY TROPOSPHERE EARTH ATMOSPHERE UF terrestrial atmosphere BT ATMOSPHERES RT AERONOMY ATMOSPHERIC EXTINCTION ATMOSPHERIC SCATTERING ATMOSPHERIC SCINTILLATION ATMOSPHERIC WINDOWS CLOUDS D LAYER E LAYER EXOSPHERE F LAYER IONOSPHERE MAGNETOSPHERE MESOPAUSE MESOSPHERE METEOROLOGY NOCTILUCENT CLOUDS OZONE LAYER SCALE HEIGHT SCINTILLATION SEEING STRATOPAUSE STRATOSPHERE TELLURIC LINES THERMOSPHERE TROPOPAUSE TROPOSPHERE TURBULENCE [EARTH ATMOSPHERE] TWILIGHT UPPER ATMOSPHERE EARTH MOON SYSTEM RT ANNUAL EQUATION EQUATION OF THE CENTER LUNAR THEORY SOLAR SYSTEM TIDAL FRICTION TWO BODY PROBLEM EARTH ORBIT RT ANNUAL EQUATION APHELION ECLIPTIC ECLIPTIC COORDINATE SYSTEM ECLIPTIC PLANE EQUATION OF TIME PERIHELION SOLAR PARALLAX TIME TROPICAL YEAR ZODIAC EARTH ROTATION RT ASTROMETRY CHANDLER WOBBLE EQUATION OF THE EQUINOXES NUTATION POLAR MOTION PRECESSION TIME EARTH SCIENCES NT GEODESY GEOLOGY GEOPHYSICS RT EARTH GEOPHYSICAL OBSERVATORIES EARTHQUAKES RT EARTH MOONQUAKES EARTHSHINE RT MOON eccentric anomaly U ANOMALY eccentric orbits U ELLIPTICAL ORBITS ECCENTRICITY BT ORBITAL ELEMENTS RT ELLIPTICAL ORBITS ECHELLE GRATINGS UF echelons BT DIFFRACTION GRATINGS RT ECHELLE SPECTRA OBJECTIVE GRATINGS REFLECTION GRATINGS SPECTROGRAPHS TRANSMISSION GRATINGS ECHELLE SPECTRA BT HIGH RESOLUTION SPECTRA SPECTRA RT ECHELLE GRATINGS ECHELLE SPECTROGRAPHS ECHELLE SPECTROGRAPHS UF echelle spectrometers BT SPECTROGRAPHS RT COUDE SPECTRA ECHELLE SPECTRA HIGH RESOLUTION SPECTRA HIGH RESOLUTION SPECTROSOPY echelle spectrometers U ECHELLE SPECTROGRAPHS echelons U ECHELLE GRATINGS ECLIPSES NT ANNULAR ECLIPSES LUNAR ECLIPSE PARTIAL ECLIPSE SOLAR ECLIPSE TOTAL ECLIPSES RT ECLIPSING BINARY STARS OCCULTATIONS PENUMBRA TRANSITS UMBRA ECLIPSING BINARY STARS UF eclipsing stars eclipsing variable stars photometric binary stars BT BINARY STARS VARIABLE STARS NT ALGOL VARIABLE STARS BETA LYRAE STARS DQ HERCULIS STARS R CANIS MAJORIS STARS UPSILON SAGITTARII STARS W URSAE MAJORIS STARS RT CONTACT BINARY STARS ECLIPSES ELLIPSOIDAL VARIABLE STARS INTERACTING BINARY STARS PARTIAL ECLIPSE PHOTOMETRIC ELEMENTS ROCHE LOBE SPECTROSCOPIC BINARY STARS TOTAL ECLIPSES eclipsing stars U ECLIPSING BINARY STARS eclipsing variable stars U ECLIPSING BINARY STARS ECLIPTIC RT EARTH ORBIT ECLIPTIC COORDINATE SYSTEM ECLIPTIC PLANE ECLIPTIC POLES EQUINOXES OBLIQUITY OF ECLIPTIC SOLSTICES ZODIAC ECLIPTIC COORDINATE SYSTEM BT COORDINATE SYSTEMS RT EARTH ORBIT ECLIPTIC ECLIPTIC LATITUDE ECLIPTIC LONGITUDE ECLIPTIC POLES ECLIPTIC LATITUDE UF celestial latitude latitude RT ECLIPTIC COORDINATE SYSTEM ECLIPTIC LONGITUDE ECLIPTIC POLES ECLIPTIC LONGITUDE UF celestial longitude longitude RT ECLIPTIC COORDINATE SYSTEM ECLIPTIC LATITUDE ECLIPTIC POLES ECLIPTIC PLANE RT EARTH ORBIT ECLIPTIC ECLIPTIC POLES OBLIQUITY OF ECLIPTIC ECLIPTIC POLES BT POLES RT ECLIPTIC ECLIPTIC COORDINATE SYSTEM ECLIPTIC LATITUDE ECLIPTIC LONGITUDE ECLIPTIC PLANE EDDINGTON LIMIT RT GRAVITATIONAL FORCE RADIATION PRESSURE STELLAR INTERIORS EDGE EFFECTS RT GALAXIES PHOTOGRAPHY education U TEACHING IN ASTRONOMY EFFECTIVE TEMPERATURE BT TEMPERATURE RT PHOTOMETRY RADIATION STANDARD CANDLES EINSTEIN COEFFICIENT RT ABSORPTION COEFFICIENT EMISSION COEFFICIENT EINSTEIN EFFECT UF einstein shift RT GRAVITATIONAL REDSHIFT EINSTEIN RINGS RT GRAVITATIONAL DEFLECTION GRAVITATIONAL LENSES einstein shift U EINSTEIN EFFECT EINSTEIN UNIVERSE BT COSMOLOGY EJECTA RT CRATERS WOLF RAYET STARS EJECTION Combine with other terms ELASTICITY Combine with other terms ELECTRIC CHARGE RT DIPOLES ELECTRICITY ELECTROSTATIC WAVES ELECTRIC CURRENTS RT CURRENT SHEETS CURRENTS ELECTRICITY ELECTRIC DIPOLES RT DIPOLES ELECTRICITY ELECTRIC FIELDS RT ELECTRICITY ELECTROSTATIC WAVES FORCE PAUL TRAP ELECTRICAL PROPERTIES RT ELECTRICITY ELECTRICITY RT ELECTRIC CHARGE ELECTRIC CURRENTS ELECTRIC DIPOLES ELECTRIC FIELDS ELECTRICAL PROPERTIES ELECTRODES NT CATHODES PHOTOCATHODES RT IMAGE TUBES PHOTOMULTIPLIER TUBES ELECTRODYNAMICS NT COSMIC ELECTRODYNAMICS electrographic cameras U ELECTRONOGRAPHIC CAMERAS ELECTROMAGNETIC Combine with other terms ELECTROMAGNETIC FIELDS RT ELECTROMAGNETIC FORCES FIELD EQUATIONS QUANTUM FIELD THEORY RADIATION FIELD ELECTROMAGNETIC FORCES BT FORCE RT ELECTROMAGNETIC FIELDS ELECTROMAGNETIC INTERACTIONS BT INTERACTIONS electromagnetic radiation U RADIATION ELECTROMAGNETIC THEORY NT COSMIC ELECTRODYNAMICS electromagnetic wave scattering U RADIATION SCATTERING ELECTROMAGNETIC WAVES BT WAVES NT BREMSSTRAHLUNG CERENKOV RADIATION GAMMA RAYS LIGHT MILLIMETER WAVES RADIO WAVES ULTRAVIOLET RADIATION X RAYS RT ELECTROSTATIC WAVES PHOTONS POLARIZATION [WAVES] WAVELENGTH ELECTRON BEAMS NT RELATIVISTIC ELECTRONS ELECTRON DENSITY BT DENSITY RT ELECTRONS ELECTRON PUMPING RT LASERS MASERS ELECTRONIC CAMERAS NT ELECTRONOGRAPHIC CAMERAS RT IMAGE TUBES ELECTRONIC EQUIPMENT NT DIODES RT INSTRUMENTATION SHOT NOISE ELECTRONICS Combine with other terms ELECTRONOGRAPHIC CAMERAS UF electrographic cameras BT ELECTRONIC CAMERAS ELECTRONS BT FUNDAMENTAL PARTICLES LEPTONS NUCLEAR RADIATION PARTICLES RT ALPHA PARTICLES BREMSSTRAHLUNG COMPTON EFFECT COMPTON SCATTERING ELECTRON DENSITY INVERSE COMPTON EFFECT INVERSE COMPTON SCATTERING PAIR ANNIHILATION PAIR PRODUCTION PHOTOIONIZATION POSITRONS RADIATIVE RECOMBINATION RADIOACTIVITY RECOMBINATION THERMIONIC EMISSION ELECTROSTATIC WAVES RT ELECTRIC CHARGE ELECTRIC FIELDS ELECTROMAGNETIC WAVES element abundance U ABUNDANCE ELEMENT FORMATION UF formation of elements RT ABUNDANCE CHEMICAL ELEMENTS FROZEN IN ELEMENTS ORIGIN ELEMENTARY PARTICLE SCATTERING BT SCATTERING RT RADIATION SCATTERING ELEMENTARY PARTICLES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF charged particles BT PARTICLES NT ANTIPARTICLES AXIONS BARYONS BOSONS GRAVITONS HADRONS LEPTONS MESONS NEUTRINOS NEUTRONS PARTONS PHOTONS PIONS QUARKS RT DARK MATTER FEYNMAN DIAGRAMS PARTICLE ACCELERATION PARTICLE CREATION PARTICLE ESCAPE PARTICLE INTERACTIONS PARTICLE PRODUCTION PLASMAS elements of orbits U ORBITAL ELEMENTS ELEVATION Use for height; use ALTITUDE [angle] for angle. UF altitude [height] elevation angle U ALTITUDE [ANGLE] ellipsoidal binary stars U ELLIPSOIDAL VARIABLE STARS ELLIPSOIDAL VARIABLE STARS UF ellipsoidal binary stars photometric binary stars BT BINARY STARS CLOSE BINARY STARS CONTACT BINARY STARS VARIABLE STARS NT BETA LYRAE STARS RT ECLIPSING BINARY STARS SPECTROSCOPIC BINARY STARS ELLIPTICAL GALAXIES UF E galaxies BT GALAXIES NT cD GALAXIES Ep GALAXIES GIANT ELLIPTICAL GALAXIES RT OBLATENESS ELLIPTICAL ORBITS UF eccentric orbits BT ORBITS PERIODIC ORBITS NT CIRCULAR ORBITS RT ANNUAL EQUATION ECCENTRICITY EQUATION OF TIME HYPERBOLIC ORBITS PARABOLIC ORBITS EMISSION COEFFICIENT RT EINSTEIN COEFFICIENT EMISSION LINE GALAXIES BT EMISSION LINE OBJECTS GALAXIES PECULIAR GALAXIES NT MARKARIAN GALAXIES SEYFERT NUCLEI RT ACTIVE GALACTIC NUCLEI ACTIVE GALAXIES EMISSION LINES H II REGIONS HARO GALAXIES SEYFERT GALAXIES EMISSION LINE OBJECTS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT EMISSION LINE GALAXIES EMISSION LINE STARS EMISSION NEBULAE H II REGIONS HERBIG HARO OBJECTS RT EMISSION LINES EMISSION LINE STARS BT ACTIVE STARS EMISSION LINE OBJECTS NT EARLY TYPE EMISSION STARS FLARE STARS FLASH STARS GAMMA CASSIOPEIAE STARS Me STARS Me VARIABLE STARS MIRA VARIABLE STARS RV TAURI STARS RW AURIGAE STARS S DORADUS STARS SHELL STARS SYMBIOTIC STARS T TAURI STARS X RAY STARS Z ANDROMEDAE STARS RT EMISSION LINES P CYGNI LINE PROFILES PECULIAR STARS PLANETARY NEBULAE U GEMINORUM STARS EMISSION LINES BT SPECTRAL LINES NT Ca II EMISSION LINES CORONAL LINES FORBIDDEN LINES RECOMBINATION LINES X RAY LINES RT ATOMIC PROCESSES EMISSION LINE GALAXIES EMISSION LINE OBJECTS EMISSION LINE STARS EMISSION NEBULAE EMISSION PROCESSES EMISSION SPECTRA FLASH SPECTRUM H II REGIONS LINE FORMATION LINE IDENTIFICATIONS LINE INTENSITITES LINE PROFILES LINE RATIOS NEUMANN LINES RADIO RECOMBINATION LINES SPECTRA SPECTROSCOPIC ANALYSIS EMISSION NEBULAE BT EMISSION LINE OBJECTS GASEOUS NEBULAE NEBULAE NT H II REGIONS HERBIG HARO OBJECTS PLANETARY NEBULAE RT EMISSION LINES T TAURI STARS EMISSION PROCESSES RT EMISSION LINES EMISSION SPECTRA EMISSION SPECTRA BT LINE SPECTRA SPECTRA NT X RAY EMISSION RT EMISSION LINES EMISSION PROCESSES FREE BOUND EMISSION LIGHT EMISSION NEUMANN LINES RAMAN EFFECT EMISSIVITY RT BLACK BODY RADIATION RADIATION TEMPERATURE ENCOUNTERS Generally of stars or galaxies. NT GALAXY ENCOUNTERS RT GALAXY MERGERS GRAVITATIONAL INTERACTIONS STELLAR DYNAMICS ENERGETIC PARTICLES RT PLASMAS ENERGY Combine with other terms NT GRAVITATIONAL ENERGY KINETIC ENERGY POTENTIAL ENERGY RT FLUX FORCE ENERGY CONTENT Combine with other terms ENERGY DISTRIBUTION Combine with other terms ENERGY LEVELS RT SPECTRA ENERGY SOURCES Combine with other terms ENERGY SPECTRA RT ABSORPTION SPECTRA ENERGY TRANSFER UF heat transfer RT ADIABATIC PROCESS CONDUCTION CONVECTION NONLTE TRANSFER RADIATION THERMODYNAMIC EQUILIBRIUM THERMODYNAMICS ENGINEERING Combine with other terms RT DESIGN ENGLISH MOUNTING BT EQUATORIAL MOUNTING ENTHALPY RT THERMODYNAMICS ENTROPY RT THERMODYNAMICS ENVELOPES Combine with other terms RT COMETS CONVECTION Ep GALAXIES BT ELLIPTICAL GALAXIES PECULIAR GALAXIES RADIO GALAXIES EPHEMERAL ACTIVE REGIONS RT SOLAR ACTIVITY EPHEMERIDES UF nautical almanac RT ALMANACS CALENDARS CATALOGS FUNDAMENTAL STARS TIME EPHEMERIS TIME BT TIME RT CIVIL TIME MEAN SOLAR TIME SOLAR DAY UNIVERSAL TIME YEAR EPOCH NT BESSELIAN EPOCH JULIAN EPOCH RT JULIAN DATE TIME EQUATION OF THE CENTER RT EARTH MOON SYSTEM MOON EQUATION OF THE EQUINOXES RT EARTH ROTATION EQUATION OF TIME EQUINOX POSITION NUTATION PRECESSION SIDEREAL TIME EQUATION OF TIME RT EARTH ORBIT ELLIPTICAL ORBITS EQUATION OF THE EQUINOXES MEAN SOLAR TIME EQUATOR Of earth; also see CELESTIAL EQUATOR. RT CELESTIAL POLES DECLINATION RIGHT ASCENSION EQUATOR CORRECTION RT CELESTIAL EQUATOR EQUATOR DETERMINATION RT CELESTIAL EQUATOR EQUATOR POSITION RT ASTROMETRY CELESTIAL EQUATOR EQUATORIAL BULGE RT GEOID OBLATENESS PLANETS ROTATION EQUATORIAL COORDINATE SYSTEM UF equatorial system BT COORDINATE SYSTEMS RT CELESTIAL EQUATOR CELESTIAL POLES DECLINATION EQUATORIAL ZONES RIGHT ASCENSION EQUATORIAL MOUNTING BT TELESCOPE MOUNTINGS NT ENGLISH MOUNTING FORK MOUNTING GERMAN MOUNTING HORSESHOE MOUNTING YOKE MOUNTING RT ALTAZIMUTH MOUNTING equatorial system U EQUATORIAL COORDINATE SYSTEM EQUATORIAL ZONES RT DECLINATION EQUATORIAL COORDINATE SYSTEM EQUILIBRIUM Combine with other terms EQUILIBRIUM FIGURES RT MODELS EQUINOX CORRECTION RT EQUINOX POSITION EQUINOX POSITION RT EQUATION OF THE EQUINOXES EQUINOX CORRECTION EQUINOXES NT AUTUMNAL EQUINOX MEAN EQUINOX VERNAL EQUINOX RT CELESTIAL EQUATOR ECLIPTIC SOLSTICES EQUIPOTENTIAL SURFACES RT CONTACT BINARY STARS EQUIVALENT WIDTHS BT LINE WIDTHS RT ABSORPTION INSTRUMENTAL PROFILES LINE BROADENING SPECTRA SPECTRAL LINES ERGOSPHERE RT BLACK HOLES EVENT HORIZON VELOCITY OF LIGHT ERROR ANALYSIS RT DATA PROCESSING DATA REDUCTION ERRORS Combine with other terms NT SELECTION EFFECTS RT CORRECTIONS ERUPTIONS RT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS ERUPTIVE BINARY STARS BT BINARY STARS CATACLYSMIC VARIABLE STARS NT ALPHA2 CANUM VENATICORUM STARS AM CANUM VENATICORUM STARS NOVAS SS CYGNI STARS SU URSAE MAJORIS STARS SX ARIETIS STARS SYMBIOTIC STARS U GEMINORUM STARS UX URSAE MAJORIS STARS WZ SAGITTAE STARS X RAY BINARY STARS Z CAMELOPARDALIS STARS RT ERUPTIONS INTERACTING BINARY STARS MASS EXCHANGE MASS LOSS X RAY SOURCES eruptive galaxies U ACTIVE GALAXIES eruptive stars U CATACLYSMIC VARIABLE STARS eruptive variable stars U CATACLYSMIC VARIABLE STARS ESCAPE VELOCITY BT VELOCITY RT ORBITAL VELOCITY PARABOLIC VELOCITY ETHANE BT HYDROCARBONS ETHYLENE BT HYDROCARBONS EVAPORATION Combine with other terms EVENT HORIZON RT BLACK HOLES ERGOSPHERE HAWKING RADIATION VELOCITY OF LIGHT EVERSHED EFFECT RT SUNSPOTS EVOLUTION Combine with other terms NT DYNAMICAL EVOLUTION STELLAR EVOLUTION RT GALAXIES PLANETS EVOLUTIONARY TRACKS NT HAYASHI TRACK HENYEY TRACK RT HERTZSPRUNG RUSSELL DIAGRAM STELLAR EVOLUTION EVOLVED STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. BT NONMAINSEQUENCE STARS NT HORIZONTAL BRANCH STARS OLD STARS PLANETARY NEBULAE POSTMAINSEQUENCE STARS PULSARS WHITE DWARF STARS RT RED GIANT TIP exchange of mass U MASS EXCHANGE EXCITATION Combine with other terms RT ATOMIC PROCESSES EXCITING STARS RT H II REGIONS PLANETARY NEBULAE EXOBIOLOGY UF astrobiology RT COSMOCHEMISTRY EXTRATERRESTRIAL LIFE EXOSPHERE RT EARTH ATMOSPHERE IONOSPHERE MAGNETOSPHERE PLANETS THERMOSPHERE TROPOSPHERE UPPER ATMOSPHERE EXPANDING ENVELOPES BT CIRCUMSTELLAR ENVELOPES RT CIRCUMSTELLAR MATTER EXPANDING UNIVERSE BT COSMOLOGY EXPANSION Combine with other terms EXPLOSIONS Combine with other terms explosive variable stars U CATACLYSMIC VARIABLE STARS EXTENDED OBJECTS RT EXTENDED SOURCES TWO DIMENSIONAL SPECTRA EXTENDED SOURCES BT RADIO SOURCES RT EXTENDED OBJECTS RADIO STRUCTURE extinction U ATMOSPHERIC EXTINCTION EXTRAGALACTIC OBJECTS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT EXTRAGALACTIC RADIO SOURCES GALAXIES QUASARS EXTRAGALACTIC RADIO SOURCES BT EXTRAGALACTIC OBJECTS RADIO SOURCES NT BL LACERTAE OBJECTS QUASARS RADIO GALAXIES EXTRASOLAR PLANETS BT PLANETS RT SOLAR SYSTEM STAR FORMATION extraterrestrial intelligence U EXTRATERRESTRIAL LIFE EXTRATERRESTRIAL LIFE UF extraterrestrial intelligence seti RT EXOBIOLOGY INTERSTELLAR COMMUNICATION LIFE EXTRATERRESTRIAL MATTER RT COSMOCHEMISTRY EXTREME CARBON STARS BT GIANT STARS INFRARED SOURCES RT CIRCUMSTELLAR SHELLS extreme population I stars U POPULATION I STARS EXTREME ULTRAVIOLET RADIATION BT ULTRAVIOLET RADIATION RT FAR ULTRAVIOLET RADIATION NEAR ULTRAVIOLET RADIATION EYEPIECES NT KELLNER EYEPIECE ORTHOSCOPIC EYEPIECE RAMSDEN EYEPIECE RT GRATICULE LENSES OPTICAL TELESCOPES RETICLE f component U F CORONA F CORONA UF f component BT CORONAS RT ZODIACAL LIGHT F DWARF STARS BT DWARF STARS F STARS F GIANT STARS BT F STARS GIANT STARS F LAYER Earth upper atmosphere. UF f region RT EARTH ATMOSPHERE IONOSPHERE f region Earth upper atmosphere. U F LAYER F REGIONS BT KAPTEYN SELECTED AREAS RT JOHNSON PHOTOMETRY PHOTOMETRY STROMGREN PHOTOMETRY F STARS BT INTERMEDIATE TYPE STARS NT F DWARF STARS F GIANT STARS F SUBDWARF STARS F SUBGIANT STARS F SUPERGIANT STARS RT SPECTRAL TYPES F SUBDWARF STARS BT F STARS SUBDWARF STARS F SUBGIANT STARS BT F STARS SUBGIANT STARS F SUPERGIANT STARS BT F STARS SUPERGIANT STARS f values U OSCILLATOR STRENGTHS FABRY PEROT INTERFEROMETERS UF perot fabry interferometers BT INTERFEROMETERS FABRY PEROT SPECTROMETERS BT SPECTROMETERS FACULAE RT CHROMOSPHERE GRANULATION PHOTOSPHERE PLAGES FAINT BLUE STARS BT EARLY TYPE STARS FAINT STARS FAINT GALAXIES Combine with other terms FAINT STARS Combine with other terms NT FAINT BLUE STARS FALSE COLOR PHOTOGRAPHY BT PHOTOGRAPHY FANAROFF RILEY CLASS RT GALAXIES RADIO GALAXIES FAR INFRARED RADIATION BT INFRARED RADIATION RT INFRARED PHOTOMETRY M MAGNITUDE N MAGNITUDE NEAR INFRARED RADIATION O MAGNITUDE P MAGNITUDE Q MAGNITUDE FAR ULTRAVIOLET RADIATION BT ULTRAVIOLET RADIATION RT EXTREME ULTRAVIOLET RADIATION NEAR ULTRAVIOLET RADIATION FARADAY EFFECT UF faraday rotation BT MAGNETO OPTICAL EFFECTS RT H II REGIONS POLARIZATION [WAVES] POLARIZED RADIATION faraday rotation U FARADAY EFFECT FAST FOURIER TRANSFORMS BT FOURIER TRANSFORMS FAST NOVAS BT NOVAS RT RECURRENT NOVAS SLOW NOVAS FEED HORNS RT ANTENNAS FEEDS HORN ANTENNAS RADIO TELESCOPES TELESCOPE INSTRUMENTATION FEEDS RT FEED HORNS TELESCOPE INSTRUMENTATION FERMI DIRAC NUCLEI BT NUCLEI [ATOMS] RT BOSE EINSTEIN NUCLEI FERMI DIRAC STATISTICS FERMI DIRAC STATISTICS RT BOSE EINSTEIN STATISTICS FERMI DIRAC NUCLEI QUANTUM MECHANICS FERMI INTERACTION BT WEAK INTERACTIONS FERMIONS BT FUNDAMENTAL PARTICLES RT BOSONS FEYNMAN DIAGRAMS RT ELEMENTARY PARTICLES FEYNMAN INTEGRALS FIBER OPTICS BT OPTICS RT OPTICAL FIBERS FIBRILLES RT CHROMOSPHERE FIELD CORRECTORS UF correcting lenses BT LENSES OPTICAL COMPONENTS RT CATADIOPTRIC SYSTEMS CORRECTOR PLATES FOCAL REDUCERS OPTICAL INSTRUMENTS FIELD CURVATURE UF curvature of field BT ABERRATIONS RT ASTIGMATISM CHROMATIC ABERRATION COMA DISTORTION OPTICAL SYSTEMS SPHERICAL ABERRATION FIELD EQUATIONS RT ELECTROMAGNETIC FIELDS RELATIVITY FIELD GALAXIES Generally, foreground or background objects FIELD OF VIEW At telescopes' foci. RT VIGNETTING FIELD STARS Generally, foreground or background objects FIGURING Polishing optics to accurate shape. BT POLISHING RT HARTMANN TEST LENSES MIRRORS OPTICAL TESTING SURFACES [OPTICAL] FILAMENTARY NEBULAE BT NEBULAE RT FILAMENTS [NEBULAE] FILAMENTS [NEBULAE] BT INTERSTELLAR MATTER RT FILAMENTARY NEBULAE NEBULAE FILAMENTS [SOLAR] RT CHROMOSPHERE FLARES PROMINENCES SUN SUNSPOTS FILLING FACTOR RT TELESCOPE ARRAYS films [optical] U OPTICAL FILMS films [photographic] U PHOTOGRAPHIC FILMS filter photometry U PHOTOMETRY FILTERS NT INTERFERENCE FILTERS OPTICAL FILTERS RT ATTENUATION FINDING CHARTS RT ATLASES MAPS SKY SURVEYS STAR ATLASES FINDING LISTS RT CATALOGS FINE ANALYSES BT ANALYSES RT DATA REDUCTION FINE STRUCTURE RT MOLECULAR LINES SPECTRAL LINES FIREBALLS BT METEORS RT BOLIDES fission U NUCLEAR FISSION five minute oscillations U SOLAR OSCILLATIONS FK CATALOG SYSTEM RT CATALOGS FLARE STARS BT DWARF STARS EMISSION LINE STARS INFRARED SOURCES RADIO STARS NT BY DRACONIS STARS RED DWARF FLARE STARS UV CETI STARS RT FLASH STARS OPTICAL FLARES OPTICAL OUTBURSTS RADIO FLARES T ASSOCIATIONS FLARES UF chromospheric eruptions NT OPTICAL FLARES OUTBURSTS RADIO FLARES X RAY FLARES RT ACTIVE SUN BURSTS FILAMENTS [SOLAR] PROMINENCES SOLAR ACTIVITY SUN FLASH SPECTRUM RT CHROMOSPHERE EMISSION LINES SOLAR ECLIPSE FLASH STARS BT EMISSION LINE STARS PREMAINSEQUENCE STARS RT FLARE STARS T ASSOCIATIONS UV CETI STARS FLAT FIELDS RT IMAGE PROCESSING TWO DIMENSIONAL DETECTORS FLATTENING Combine with other terms FLEXURE Combine with other terms flocculi U PLAGES FLOW Combine with other terms NT NONEQUILIBRIUM FLOW RT FLUID DYNAMICS FLOW INSTABILITY RT NONEQUILIBRIUM FLOW FLUCTUATIONS Combine with other terms FLUID DYNAMICS BT FLUID MECHANICS NT HYDRODYNAMICS RELATIVISTIC FLUID DYNAMICS RT FLOW MASS TRANSFER FLUID MECHANICS NT FLUID DYNAMICS RT RAYLEIGH TAYLOR INSTABILITY FLUORESCENCE NT X RAY FLUORESCENCE RT LUMINESCENCE PHOTOLUMINESCENCE SPECTRA FLUX Combine with other terms RT ENERGY LUMINOSITY FLUX DENSITY RT LUMINOSITY RADIATION FOCAL LENGTH RT FOCAL REDUCERS FOCUS FOCAL REDUCERS RT FIELD CORRECTORS FOCAL LENGTH FOCUS NT CASSEGRAIN FOCUS COUDE FOCUS NASMYTH FOCUS NEWTONIAN FOCUS PRIME FOCUS RT ABERRATIONS FOCAL LENGTH TELESCOPES FOKKER PLANCK EQUATION RT STELLAR DYNAMICS FORBIDDEN LINES BT EMISSION LINES RT FORBIDDEN TRANSITIONS NEBULAE SPECTRA FORBIDDEN TRANSITIONS RT FORBIDDEN LINES NEBULAE SPECTRA FORBUSH EFFECT RT COSMIC RAYS SOLAR PHYSICS FORCE Combine with other terms NT CENTRIFUGAL FORCE CENTRIPETAL FORCE ELECTROMAGNETIC FORCES GRAVITATIONAL FORCE RT ELECTRIC FIELDS ENERGY MAGNETIC FIELDS force of gravity U GRAVITATION GRAVITATIONAL FORCE FORECASTS Combine with other terms RT PREDICTIONS FORK MOUNTING BT EQUATORIAL MOUNTING FORMATION Combine with other terms formation of elements U ELEMENT FORMATION formation of galaxies U GALAXY FORMATION formation of stars U STAR FORMATION four color photometry U STROMGREN PHOTOMETRY FOURIER ANALYSIS UF harmonic analysis RT FOURIER COMPONENTS FOURIER TRANSFORMS FUNDAMENTAL FREQUENCY HARMONIC FREQUENCIES MAXIMUM ENTROPY METHODS MULTIPERIODIC PULSATION OVERTONE FREQUENCIES WAVEFORM ANALYSIS FOURIER COMPONENTS RT FOURIER ANALYSIS HARMONIC FREQUENCIES FOURIER SPECTROMETERS BT SPECTROMETERS FOURIER TRANSFORM SPECTROSCOPY BT SPECTROSCOPY FOURIER TRANSFORMS NT FAST FOURIER TRANSFORMS RT FOURIER ANALYSIS FRAGMENTATION Combine with other terms FRAGMENTS Combine with other terms FRAUNHOFER LINES Not a complete list of terms. NT b BAND G BAND H LINE K LINE RT ABSORPTION SPECTRA SUN FREE BOUND EMISSION BT RADIATION MECHANISMS RT EMISSION SPECTRA SPECTRA FREE FREE EMISSION BT RADIATION MECHANISMS RT SPECTRA THERMAL EMISSION free free transition U BREMSSTRAHLUNG FREQUENCY Combine with other terms RT WAVELENGTH FREQUENCY ANALYSIS RT MAXIMUM ENTROPY METHODS MULTIPERIODIC PULSATION FREQUENCY DISTRIBUTION RT DISTRIBUTION FUNCTION HESS DIAGRAM FREQUENCY SHIFT RT BLUE SHIFT PULSARS REDSHIFT FREQUENCY STANDARDS RT INSTRUMENTATION FRICTION NT DYNAMICAL FRICTION FRIEDMANN UNIVERSE BT COSMOLOGY RT BIG BANG THEORY OSCILLATING UNIVERSE fringe patterns U INTERFERENCE FRINGES fringes U INTERFERENCE FRINGES FROZEN IN ELEMENTS RT ELEMENT FORMATION SUPERNOVAS FU ORIONIS STARS BT INFRARED SOURCES T TAURI STARS RT MASS LOSS T ASSOCIATIONS FUNCTIONS In mathematics. NT DISTRIBUTION FUNCTION FUNDAMENTAL CONSTANTS NT ASTRONOMICAL CONSTANTS FUNDAMENTAL FREQUENCY RT FOURIER ANALYSIS FUNDAMENTAL MODE HARMONIC FREQUENCIES OVERTONE FREQUENCIES VARIABLE STARS FUNDAMENTAL MODE BT PULSATION MODES RT FUNDAMENTAL FREQUENCY OVERTONE MODES FUNDAMENTAL PARTICLES BT PARTICLES NT ELECTRONS FERMIONS NEUTRONS PROTONS FUNDAMENTAL STARS RT ASTROMETRY CATALOGS EPHEMERIDES FUNDAMENTAL SYSTEM Combine with other terms RT POSITIONS FUNNELING RT LATE TYPE GIANT STARS STELLAR EVOLUTION fusion U NUCLEAR FUSION FUTURE LIGHT CONE BT LIGHT CONE RT PAST LIGHT CONE G BAND BT FRAUNHOFER LINES MOLECULAR BANDS RT MOLECULAR SPECTRA G DWARF STARS BT DWARF STARS G STARS G FACTOR RT ANGULAR MOMENTUM G GIANT STARS BT G STARS GIANT STARS RT G SUBGIANT STARS G STARS BT INTERMEDIATE TYPE STARS NT G DWARF STARS G GIANT STARS G SUBDWARF STARS G SUBGIANT STARS G SUPERGIANT STARS RT SPECTRAL TYPES G SUBDWARF STARS BT G STARS SUBDWARF STARS G SUBGIANT STARS BT G STARS SUBGIANT STARS RT G GIANT STARS G SUPERGIANT STARS BT G STARS SUPERGIANT STARS GALACTIC Used as an adjective only for Milky Way properties. See also GALAXY. GALACTIC ANTICENTER UF anticenter RT GALACTIC COORDINATE SYSTEM MILKY WAY GALAXY galactic bars U BARRED SPIRAL GALAXIES GALACTIC BULGE RT GALACTIC CENTER GALACTIC PLANE GALACTIC STRUCTURE MILKY WAY GALAXY GALACTIC CENTER RT GALACTIC BULGE GALACTIC COORDINATE SYSTEM GALACTIC STRUCTURE MILKY WAY GALAXY galactic clusters U OPEN STAR CLUSTERS GALACTIC COORDINATE SYSTEM BT COORDINATE SYSTEMS RT GALACTIC ANTICENTER GALACTIC CENTER GALACTIC LATITUDE GALACTIC LONGITUDE GALACTIC POLES MILKY WAY GALAXY galactic cosmic rays U COSMIC RAYS GALACTIC EQUATOR RT GALACTIC LATITUDE GALACTIC LONGITUDE GALACTIC POLES GALACTIC HALO BT HALOS RT GALACTIC STRUCTURE GLOBULAR STAR CLUSTERS HALO STARS POPULATION II STARS RR LYRAE STARS GALACTIC LATITUDE UF latitude RT GALACTIC COORDINATE SYSTEM GALACTIC EQUATOR GALACTIC LONGITUDE GALACTIC PLANE GALACTIC POLES GALACTIC LONGITUDE UF longitude RT GALACTIC COORDINATE SYSTEM GALACTIC EQUATOR GALACTIC LATITUDE GALACTIC POLES GALACTIC NUCLEI BT NUCLEI [CELESTIAL OBJECTS] NT ACTIVE GALACTIC NUCLEI COMPACT NUCLEI RT BLACK HOLES GALACTIC STRUCTURE MASSIVE OBJECTS N GALAXIES POPULATION II STARS GALACTIC PLANE RT DISK POPULATION DISK STARS GALACTIC BULGE GALACTIC LATITUDE GALACTIC POLES GALACTIC WINDOWS MILKY WAY GALAXY GALACTIC POLES BT POLES NT NORTH GALACTIC POLE SOUTH GALACTIC POLE RT GALACTIC COORDINATE SYSTEM GALACTIC EQUATOR GALACTIC LATITUDE GALACTIC LONGITUDE GALACTIC PLANE GALACTIC SPURS GALACTIC ROTATION RT COSMIC YEAR HIGH VELOCITY CLOUDS HIGH VELOCITY STARS KINEMATICS OORT CONSTANTS OORT FORMULAS PROPER MOTIONS SPACE MOTION STELLAR DYNAMICS GALACTIC SPURS RT GALACTIC POLES GALACTIC STRUCTURE GALACTIC STRUCTURE RT GALACTIC BULGE GALACTIC CENTER GALACTIC HALO GALACTIC NUCLEI GALACTIC SPURS KINEMATICS OORT CONSTANTS OORT FORMULAS PITCH ANGLE SPIRAL ARMS STAR COUNTS GALACTIC WINDOWS Directions of low absorption. BT WINDOWS RT GALACTIC PLANE INTERSTELLAR ABSORPTION GALAXIES BT EXTRAGALACTIC OBJECTS NT ACTIVE GALAXIES BARRED SPIRAL GALAXIES BIPOLAR GALAXIES BL LACERTAE OBJECTS BLUE GALAXIES BRIGHT GALAXIES COMPANION GALAXIES D GALAXIES DOUBLE GALAXIES DWARF GALAXIES EARLY TYPE GALAXIES ELLIPTICAL GALAXIES EMISSION LINE GALAXIES GIANT GALAXIES HARO GALAXIES HEAD TAIL GALAXIES HYPERGALAXIES INFRARED GALAXIES INTERACTING GALAXIES IRREGULAR GALAXIES LATE TYPE GALAXIES LENTICULAR GALAXIES MAGELLANIC CLOUDS MILKY WAY GALAXY MULTIPLE GALAXIES N GALAXIES NEARBY GALAXIES PECULIAR GALAXIES PRIMORDIAL GALAXIES PROTOGALAXIES RADIO GALAXIES RING GALAXIES SPIRAL GALAXIES STARBURST GALAXIES RT ACTIVE GALACTIC NUCLEI COLLISIONS COMAS CONTENT OF GALAXIES COOLING FLOWS DIFFERENTIAL ROTATION EDGE EFFECTS EVOLUTION FANAROFF RILEY CLASS HALOS HOLMBERG RADIUS HUBBLE CLASSIFICATION HUBBLE DIAGRAM INTEGRATED MAGNITUDE LOCAL SUPERCLUSTER MASS TO LIGHT RATIOS ORIGIN QUASAR GALAXY PAIRS SURFACE PHOTOMETRY TULLY FISHER RELATION VELOCITY FIELD GALAXY Combine with other terms for galaxies other than the Milky Way. See also GALACTIC. galaxy clustering U CLUSTERS OF GALAXIES galaxy clusters U CLUSTERS OF GALAXIES GALAXY CONTENT Combine with other terms GALAXY COUNTS RT CLUSTERS OF GALAXIES COSMOLOGY GALAXY DISTRIBUTION OBSERVATIONAL COSMOLOGY GALAXY DISTRIBUTION RT CLUSTERS OF GALAXIES COSMOLOGY GALAXY COUNTS OBSERVATIONAL COSMOLOGY GALAXY ENCOUNTERS BT ENCOUNTERS RT GALAXY MERGERS INTERACTING GALAXIES RADIO SOURCES GALAXY EVOLUTION RT COSMOLOGY GALAXY FORMATION UF formation of galaxies GALAXY MERGERS UF mergers RT CLUSTERS OF GALAXIES DOUBLE GALAXIES ENCOUNTERS GALAXY ENCOUNTERS INTERACTING GALAXIES GALAXY VOIDS RT BLANK FIELDS INTERGALACTIC SPACE galaxy [the] U MILKY WAY GALAXY GALILEAN SATELLITES BT SATELLITES RT PLANETS GAMMA CASSIOPEIAE STARS BT B DWARF STARS CATACLYSMIC VARIABLE STARS EMISSION LINE STARS IRREGULAR VARIABLE STARS SHELL STARS gamma radiation U GAMMA RAYS GAMMA RAY ASTRONOMY BT SPACE ASTRONOMY RT BALLOON BORNE INSTRUMENTS ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS GAMMA RAY BACKGROUND BT BACKGROUND RADIATION RT GAMMA RAYS MICROWAVE BACKGROUND RADIO BACKGROUND ULTRAVIOLET BACKGROUND X RAY BACKGROUND GAMMA RAY BURSTS UF cosmic gamma ray bursts BT BURSTS RT BURSTERS GAMMA RAY SOURCES OPTICAL BURSTS RADIO BURSTS RAPID BURSTS X RAY BURSTS GAMMA RAY LINES RT GAMMA RAYS GAMMA RAY OBSERVATORIES See OBSERVATORIES for more RTs. BT OBSERVATORIES SPACE OBSERVATORIES RT ARTIFICIAL SATELLITES GAMMA RAY TELESCOPES GAMMA RAY SCATTERING BT SCATTERING RT GAMMA RAYS GAMMA RAY SOURCES RT GAMMA RAY BURSTS GAMMA RAYS OPTICAL IDENTIFICATIONS GAMMA RAY SPECTRA RT GAMMA RAY SPECTROSCOPY GAMMA RAYS GAMMA RAY SPECTROGRAPHS BT SPECTROGRAPHS GAMMA RAY SPECTROSCOPY BT SPECTROSCOPY RT GAMMA RAY SPECTRA GAMMA RAY TELESCOPES BT SPACE TELESCOPES TELESCOPES RT GAMMA RAY OBSERVATORIES GAMMA RAYS Combine with other terms UF gamma radiation BT ELECTROMAGNETIC WAVES HIGH ENERGY RADIATION NUCLEAR RADIATION RADIATION RT CERENKOV RADIATION GAMMA RAY BACKGROUND GAMMA RAY LINES GAMMA RAY SCATTERING GAMMA RAY SOURCES GAMMA RAY SPECTRA PAIR ANNIHILATION PAIR PRODUCTION RADIOACTIVITY GAS See also GASES Combine with other terms RT GAS CONTENT GAS DENSITY GAS DISTRIBUTION GAS DYNAMICS GAS TO DUST RATIO GASEOUS DISKS GASEOUS NEBULAE GASEOUS SPHERES GAS CLOUDS BT CLOUDS GAS CONTENT RT GAS GAS DENSITY BT DENSITY RT GAS OPTICAL DEPTH GAS DISTRIBUTION RT GAS SPIRAL ARMS GAS DYNAMICS UF gas kinematics RT GAS gas kinematics U GAS DYNAMICS GAS TO DUST RATIO RT DUST GAS INTERSTELLAR REDDENING REDDENING LAW SELECTIVE ABSORPTION GASEOUS DISKS BT DISKS RT DISK STARS GAS GASEOUS NEBULAE BT NEBULAE NT EMISSION NEBULAE RT GAS GASEOUS SPHERES NT PROTOGALAXIES PROTOSTARS STROMGREN SPHERE RT GAS GASES Constituents of gas clouds. See also Table of Elements. See also GAS NT AIR CARBON DIOXIDE CARBON MONOXIDE IONIZED GASES NEUTRAL GASES RELATIVISTIC PLASMAS GEGENSCHEIN UF counterglow RT INTERPLANETARY MATTER NIGHT SKY BRIGHTNESS ZODIACAL DUST ZODIACAL LIGHT GENERAL THEORY OF RELATIVITY BT RELATIVITY NT SPECIAL THEORY OF RELATIVITY RT COSMOLOGY CURVATURE OF SPACE TIME GRAVITATION GRAVITATIONAL EFFECTS GRAVITATIONAL WAVES NEWTONIAN GRAVITATION SCHWARZSCHILD METRIC SCHWARZSCHILD RADIUS SPACE TIME GENEVA PHOTOMETRY UF UBVGRI photometry BT MEDIUM BAND PHOTOMETRY PHOTOMETRIC SYSTEMS RT VILNIUS PHOTOMETRY GEOCENTRIC ORBITS BT ORBITS GEOCORONA RT EARTH GEODESY BT EARTH SCIENCES NT ASTRONOMICAL GEODESY SPACE GEODESY RT ATOMIC CLOCKS EARTH GEOID PENDULUMS GEOID RT EARTH EQUATORIAL BULGE GEODESY GEOLOGY BT EARTH SCIENCES NT PETROLOGY RT GEOPHYSICAL OBSERVATORIES GLACIOLOGY PLANETOLOGY PLANETS SURFACES [CELESTIAL BODIES] GEOMAGNETIC FIELD BT MAGNETIC FIELDS GEOMAGNETISM RT CONTINENTAL DRIFT EARTH GEOPHYSICAL OBSERVATORIES PALEOMAGNETISM PLANETS GEOPHYSICAL OBSERVATORIES See OBSERVATORIES for more RTs. BT OBSERVATORIES RT EARTH SCIENCES GEOLOGY GEOMAGNETISM GEOPHYSICS UF terrestrial physics BT EARTH SCIENCES RT CONTINENTAL DRIFT EARTH GEOSTATIONARY SATELLITES BT ARTIFICIAL SATELLITES GERMAN MOUNTING BT EQUATORIAL MOUNTING GIANT BRANCH NT RED GIANT TIP RT HERTZSPRUNG GAP HERTZSPRUNG RUSSELL DIAGRAM INSTABILITY STRIP TURNOFF POINT ZERO AGE HORIZONTAL BRANCH GIANT BRANCH STARS RT HORIZONTAL BRANCH STARS GIANT ELLIPTICAL GALAXIES BT ELLIPTICAL GALAXIES GIANT GALAXIES BT GALAXIES NT cD GALAXIES GIANT MOLECULAR CLOUDS BT MOLECULAR CLOUDS RT INTERSTELLAR MOLECULES GIANT PLANETS BT PLANETS GIANT RADIO GALAXIES BT RADIO GALAXIES RT cD GALAXIES N GALAXIES GIANT STARS UF cs stars BT POSTMAINSEQUENCE STARS NT A GIANT STARS B GIANT STARS CH STARS CN STARS EXTREME CARBON STARS F GIANT STARS G GIANT STARS LATE TYPE GIANT STARS Lb VARIABLE STARS M GIANT STARS OH IR STARS PECULIAR GIANT STARS R STARS S STARS WEAK G BAND STARS RT CARBON BURNING DREDGE UP LITHIUM STARS LUMINOSITY CLASSIFICATION STELLAR EVOLUTION ZIRCONIUM STARS GLACIOLOGY RT EARTH GEOLOGY GLASS BT OPTICAL MATERIALS NT OPTICAL GLASS RT LENSES MIRRORS OPTICAL FIBERS glass fibers U OPTICAL FIBERS GLOBULAR STAR CLUSTERS BT STAR CLUSTERS RT DIFFERENTIAL ROTATION GALACTIC HALO HALO STARS HORIZONTAL BRANCH STARS OOSTERHOFF GROUPS POPULATION II STARS RR LYRAE STARS TURNOFF POINT GLOBULES BT INTERSTELLAR MATTER NT BOK GLOBULES RT DARK NEBULAE GOEDEL UNIVERSE BT COSMOLOGY GOULDS BELT RT MILKY WAY GALAXY STAR ASSOCIATIONS grading function U APERTURE SYNTHESIS GRAINS BT INTERSTELLAR MATTER NT INTERPLANETARY GRAINS RT INTERPLANETARY DUST INTERSTELLAR DUST GRANULATION NT SUPERGRANULATION RT CONVECTION FACULAE PHOTOSPHERE SUN GRANULES RT PHOTOSPHERE SUN GRAPHITE RT INTERPLANETARY GRAINS INTERSTELLAR DUST GRAPHS Combine with other terms GRATICULE RT EYEPIECES RETICLE GRATING RESPONSE RT ARRAYS GRATING RING RT APERTURE SYNTHESIS GRATING SPECTROGRAPHS BT SPECTROGRAPHS RT DIFFRACTION GRATINGS PRISM SPECTROGRAPHS gratings U DIFFRACTION GRATINGS GRAVIMETRY RT ACCELERATION GRAVITATING DISKS BT DISKS RT CIRCUMSTELLAR MATTER GRAVITATION UF force of gravity RT CELESTIAL MECHANICS GENERAL THEORY OF RELATIVITY GRAVITATIONAL COLLAPSE GRAVITATIONAL FORCE GRAVITATIONAL INSTABILITY GRAVITATIONAL INTERACTIONS GRAVITATIONAL RADIATION GRAVITATIONAL REDSHIFT GRAVITY LAGRANGIAN POINTS MASS PERTURBATION THEORY RELATIVITY ROCHE LIMIT VIRIAL THEOREM GRAVITATIONAL COLLAPSE BT COLLAPSE RT BLACK HOLES CHANDRASEKHAR LIMIT CHANDRASEKHAR SCHONBERG LIMIT GRAVITATION GRAVITATIONAL ENERGY SUPERNOVAS GRAVITATIONAL CONSTANT BT ASTRONOMICAL CONSTANTS CONSTANTS RT NEWTONIAN GRAVITATION GRAVITATIONAL DEFLECTION RT DOUBLE QUASARS EINSTEIN RINGS GRAVITATIONAL LENSES GRAVITATIONAL EFFECTS RT GENERAL THEORY OF RELATIVITY GRAVITATIONAL ENERGY BT ENERGY RT GRAVITATIONAL COLLAPSE GRAVITATIONAL EQUILIBRIUM RT STELLAR EVOLUTION GRAVITATIONAL FIELDS UF gravity fields RT LAGRANGIAN POINTS QUANTUM FIELD THEORY SCHWARZSCHILD METRIC GRAVITATIONAL FORCE UF force of gravity BT FORCE RT EDDINGTON LIMIT GRAVITATION NEWTONIAN GRAVITATION SURFACE GRAVITY GRAVITATIONAL INSTABILITY RT GRAVITATION GRAVITATIONAL INTERACTIONS BT INTERACTIONS RT ENCOUNTERS GRAVITATION GRAVITATIONAL LENSES RT BLACK HOLES DOUBLE QUASARS EINSTEIN RINGS GRAVITATIONAL DEFLECTION LIGHT LUMINOUS ARCS MICROLENSING WHITE HOLES GRAVITATIONAL RADIATION BT RADIATION RT GRAVITATION RADIATION MECHANISMS GRAVITATIONAL REDSHIFT BT REDSHIFT RT EINSTEIN EFFECT GRAVITATION GRAVITATIONAL WAVES BT WAVES RT CELESTIAL MECHANICS GENERAL THEORY OF RELATIVITY GRAVITONS BT ELEMENTARY PARTICLES GRAVITY UF acceleration of gravity RT GRAVITATION JEANS LENGTH PENDULUMS RELATIVISTIC ASTROPHYSICS VON ZEIPEL THEOREM GRAVITY ANOMALIES BT ANOMALIES RT MAGNETIC ANOMALIES MASCONS GRAVITY DARKENING RT SURFACE BRIGHTNESS SURFACE GRAVITY VON ZEIPEL THEOREM gravity fields U GRAVITATIONAL FIELDS GRAVITY WAVES BT WAVES RT ACOUSTIC WAVES STELLAR INTERIORS GRAZING INCIDENCE Combine with other terms grazing incidence spectrographs U X RAY SPECTROGRAPHS grazing incidence telescopes U X RAY TELESCOPES GREAT ATTRACTOR RT CLUSTERS OF GALAXIES LOCAL SUPERCLUSTER GREENHOUSE EFFECT RT ATMOSPHERES INFRARED RADIATION PLANETS POLLUTION TERRESTRIAL RADIATION GREGORIAN CALENDAR BT CALENDARS RT JULIAN CALENDAR TIME GRIDS RT RESEAUX RETICLE GRISMS BT OPTICAL COMPONENTS RT DIFFRACTION GRATINGS PRISMS SPECTROGRAPHS TRANSMISSION GRATINGS GROUND BASED ASTRONOMY BT ASTRONOMY RT AIRPLANE BORNE INSTRUMENTS BALLOON BORNE INSTRUMENTS ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE PROBE INSTRUMENTS SPACE TELESCOPES GROUPS OF GALAXIES NT LOCAL GROUP OF GALAXIES RT COMPANION GALAXIES MULTIPLE GALAXIES GUIDE SYSTEMS BT INSTRUMENTATION NT AUTOGUIDERS RT CONTROL SYSTEMS QUADRANT DETECTORS TELESCOPES GUNN DIODES RT SEMICONDUCTOR DEVICES GYROSYNCHROTRON RADIATION BT SYNCHROTRON RADIATION H ALPHA BT RESONANCE LINES RT BALMER SERIES H ALPHA EMISSION LINE STARS RT RW AURIGAE STARS T ASSOCIATIONS VARIABLE STARS H ALPHA PHOTOMETRY BT NARROW BAND PHOTOMETRY H AND K LINES BT CALCIUM LINES NT H LINE K LINE H BETA RT BALMER SERIES H BETA PHOTOMETRY BT NARROW BAND PHOTOMETRY RT STROMGREN PHOTOMETRY H I U NEUTRAL HYDROGEN H I ABSORPTION RT 21 CM LINE H I CLOUDS H I CLOUDS RT 21 CM LINE H I ABSORPTION H I CONTENT RT 21 CM LINE H I EMISSION RT 21 CM LINE H I REGIONS BT INTERSTELLAR MATTER RT 21 CM LINE NEUTRAL GASES RADIO ABSORPTION RADIO RECOMBINATION LINES H II REGIONS BT EMISSION LINE OBJECTS EMISSION NEBULAE INTERSTELLAR MATTER NT COMPACT H II REGIONS RT BOK GLOBULES EMISSION LINE GALAXIES EMISSION LINES EXCITING STARS FARADAY EFFECT NEBULAE PLASMAS RADIO RECOMBINATION LINES YOUNG STARS H LINE BT FRAUNHOFER LINES H AND K LINES RT K LINE H MAGNITUDE BT APPARENT MAGNITUDES RT INFRARED PHOTOMETRY NEAR INFRARED RADIATION h minus ion U NEGATIVE H ION h s variable stars U HUBBLE SANDAGE VARIABLE STARS HADRON BARRIER RT BIG BANG THEORY HADRONS BT ELEMENTARY PARTICLES RT BOSONS HALATION RT IMAGES PHOTOGRAPHIC EMULSIONS TURBIDITY HALF WAVE DIPOLES BT DIPOLES RT RADIO TELESCOPES YAGI ANTENNAS HALO STARS BT POPULATION II STARS RT GALACTIC HALO GLOBULAR STAR CLUSTERS HALOS STELLAR POPULATIONS HALOS NT GALACTIC HALO RT COMETS CORONAS GALAXIES HALO STARS LIGHT SCATTERING HANLE EFFECT RT PROMINENCES SUN HARMAN SEATON SEQUENCE RT HERTZSPRUNG RUSSELL DIAGRAM PLANETARY NEBULAE SUBDWARF STARS harmonic analysis U FOURIER ANALYSIS HARMONIC FREQUENCIES Refers only to Fourier components of non-sinusoidal waves. See also OVERTONE FREQUENCIES. UF harmonic overtones harmonics RT FOURIER ANALYSIS FOURIER COMPONENTS FUNDAMENTAL FREQUENCY OVERTONE FREQUENCIES harmonic overtones U HARMONIC FREQUENCIES OVERTONE FREQUENCIES harmonics U HARMONIC FREQUENCIES HARO GALAXIES BT GALAXIES RT EMISSION LINE GALAXIES HARTMANN TEST RT FIGURING IMAGES OPTICAL INSTRUMENTS harvard classification U HENRY DRAPER SYSTEM HAWKING RADIATION RT BLACK HOLES EVENT HORIZON HAYASHI TRACK BT EVOLUTIONARY TRACKS RT CONVECTION HERTZSPRUNG RUSSELL DIAGRAM HD CURVE Hurter and Driffield curve. RT PHOTOGRAPHY hd system U HENRY DRAPER SYSTEM HE+ IONIZATION ZONE RT CEPHEIDS DELTA SCUTI STARS KAPPA MECHANISM PULSATING VARIABLE STARS PULSATION THEORY RADIAL PULSATIONS VARIABLE STARS ZZ CETI STARS HEAD TAIL GALAXIES BT GALAXIES RADIO GALAXIES RADIO SOURCES RT RADIO STRUCTURE TAILS heat transfer U ENERGY TRANSFER HEAVY ELEMENTS BT CHEMICAL ELEMENTS RT ABUNDANCE HEAVY METAL STARS BT LATE TYPE GIANT STARS PECULIAR STARS RT BARIUM STARS S STARS ZIRCONIUM STARS HELIOCENTRIC CORRECTION Correction of velocities and times to the sun's position. RT ASTRONOMICAL UNIT COORDINATE SYSTEMS HELIOCENTRIC JULIAN DATE HELIOCENTRIC VELOCITY HELIOCENTRIC JULIAN DATE UF hjd BT JULIAN DATE RT HELIOCENTRIC CORRECTION HELIOCENTRIC ORBITS BT ORBITS heliocentric parallax U ANNUAL PARALLAX HELIOCENTRIC VELOCITY BT VELOCITY RT HELIOCENTRIC CORRECTION heliographs HELIOMETERS BT MEASURING INSTRUMENTS HELIOPAUSE RT SOLAR ATMOSPHERE SOLAR WIND HELIOSEISMOLOGY See SOLAR SEISMOLOGY UF solar seismology BT ASTEROSEISMOLOGY SEISMOLOGY RT SOLAR OSCILLATIONS HELIOSPHERE RT INTERPLANETARY MATTER INTERSTELLAR GAS SOLAR ACTIVITY SOLAR ATMOSPHERE SOLAR WIND HELIOSTATS BT COELOSTATS RT SIDEROSTATS SOLAR TELESCOPES TELESCOPE MOUNTINGS HELIUM BURNING BT NUCLEAR FUSION NUCLEOSYNTHESIS RT CARBON BURNING HELIUM FLASH HELIUM SHELL FLASH HYDROGEN BURNING INNER CORE OXYGEN BURNING SHELL BURNING SILICON BURNING STELLAR EVOLUTION STELLAR INTERIORS helium detonation U HELIUM FLASH HELIUM FLASH UF helium detonation RT CARBON FLASH HELIUM BURNING HELIUM SHELL FLASH NUCLEAR FUSION RED GIANT TIP HELIUM POOR STARS NT Bw STARS RT ABUNDANCE METAL ABUNDANCE HELIUM RICH STARS RT ABUNDANCE METAL ABUNDANCE HELIUM SHELL FLASH RT HELIUM BURNING HELIUM FLASH NUCLEAR FUSION helium variable stars U SX ARIETIS STARS HELMHOLTZ KELVIN CONTRACTION UF kelvin helmholtz contraction RT KELVIN TIMESCALE HENRY DRAPER CATALOG BT CATALOGS RT HENRY DRAPER SYSTEM SPECTRAL CLASSIFICATION HENRY DRAPER SYSTEM UF harvard classification hd system BT SPECTRAL CLASSIFICATION RT HENRY DRAPER CATALOG HENYEY TRACK BT EVOLUTIONARY TRACKS RT HERTZSPRUNG RUSSELL DIAGRAM STELLAR EVOLUTION HERBIG HARO OBJECTS UF hh objects BT EMISSION LINE OBJECTS EMISSION NEBULAE INFRARED SOURCES INTRINSIC VARIABLE STARS PREMAINSEQUENCE STARS RT PROTOSTARS T ASSOCIATIONS T TAURI STARS herbig stars U Ae STARS Be STARS HERTZSPRUNG GAP RT GIANT BRANCH HERTZSPRUNG RUSSELL DIAGRAM HERTZSPRUNG RUSSELL DIAGRAM UF hr diagram RT ABSOLUTE MAGNITUDE ASYMPTOTIC GIANT BRANCH COLOR LUMINOSITY RELATION COLOR MAGNITUDE RELATION EVOLUTIONARY TRACKS GIANT BRANCH HARMAN SEATON SEQUENCE HAYASHI TRACK HENYEY TRACK HERTZSPRUNG GAP HESS DIAGRAM INSTABILITY STRIP LUMINOSITY MAINSEQUENCE RED GIANT TIP SPECTRA STELLAR EVOLUTION TURNOFF POINT ZERO AGE HORIZONTAL BRANCH ZERO AGE MAINSEQUENCE HESS DIAGRAM RT FREQUENCY DISTRIBUTION HERTZSPRUNG RUSSELL DIAGRAM HETERODYNE Combine with other terms RT INTERFEROMETERS SPECTROSCOPY hh objects U HERBIG HARO OBJECTS HIERARCHICAL COSMOLOGY BT COSMOLOGY high dispersion spectra U HIGH RESOLUTION SPECTRA high dispersion spectroscopy U HIGH RESOLUTION SPECTROSOPY HIGH ENERGY ASTROPHYSICS UF high energy processes RT COSMIC RAY ASTRONOMY INVERSE COMPTON EFFECT NUCLEAR ASTROPHYSICS PARTICLE BEAMS high energy processes U HIGH ENERGY ASTROPHYSICS HIGH ENERGY RADIATION BT RADIATION NT COSMIC RAYS GAMMA RAYS X RAYS RT X RAY LUMINOSITY HIGH LUMINOSITY STARS UF luminous stars bright stars NT LUMINOUS BLUE VARIABLE STARS NOVAS SUPERGIANT STARS SUPERNOVAS HIGH RESOLUTION SPECTRA UF high dispersion spectra NT COUDE SPECTRA ECHELLE SPECTRA RT COUDE SPECTROGRAPHS ECHELLE SPECTROGRAPHS HIGH RESOLUTION SPECTROSOPY UF high dispersion spectroscopy BT SPECTROSCOPY RT COUDE SPECTROGRAPHS ECHELLE SPECTROGRAPHS HIGH SPEED PHOTOMETERS BT PHOTOMETERS RT TIME RESOLVED SPECTROSCOPY VARIABLE STARS HIGH TEMPERATURE Combine with other terms UF hot HIGH VELOCITY CLOUDS RT GALACTIC ROTATION HIGH VELOCITY STARS MILKY WAY GALAXY VELOCITY HIGH VELOCITY STARS RT GALACTIC ROTATION HIGH VELOCITY CLOUDS MILKY WAY GALAXY ORBITS RUNAWAY STARS VELOCITY HIRAYAMA FAMILIES BT MINOR PLANET FAMILIES RT APOLLO GROUP HISTORY OF ASTRONOMY Combine with other terms NT ARCHAEOASTRONOMY hjd U HELIOCENTRIC JULIAN DATE HOLMBERG RADIUS RT GALAXIES HOLMIUM STARS BT Ap STARS PECULIAR STARS HOLTSMARK APPROXIMATION RT PLASMAS HORIZON RT ALTITUDE [ANGLE] AZIMUTH CELESTIAL SPHERE HORIZON COORDINATE SYSTEM HORIZON COORDINATE SYSTEM BT COORDINATE SYSTEMS RT ALTAZIMUTH MOUNTING ALTITUDE [ANGLE] AZIMUTH HORIZON NADIR ZENITH HORIZONTAL BRANCH STARS BT EVOLVED STARS POPULATION II STARS RT GIANT BRANCH STARS GLOBULAR STAR CLUSTERS RR LYRAE STARS HORIZONTAL PARALLAX BT DIURNAL PARALLAX HORN ANTENNAS BT ANTENNAS RADIO WAVEGUIDES RT FEED HORNS HORSESHOE MOUNTING BT EQUATORIAL MOUNTING hot U HIGH TEMPERATURE hot stars See also GASES U EARLY TYPE STARS HOUR ANGLE RT RIGHT ASCENSION SIDEREAL TIME TRANSIT TIME hr diagram U HERTZSPRUNG RUSSELL DIAGRAM HUBBLE CLASSIFICATION UF hubble sequence RT GALAXIES HUBBLE CONSTANT RT COSMOLOGICAL DISTANCE SCALE COSMOLOGY HUBBLE TIME REDSHIFT MAGNITUDE RELATION HUBBLE DIAGRAM RT COSMOLOGY GALAXIES REDSHIFT REDSHIFT MAGNITUDE RELATION HUBBLE LAW RT COSMOLOGY OBSERVATIONAL COSMOLOGY REDSHIFT REDSHIFT MAGNITUDE RELATION HUBBLE RADIUS RT BIG BANG THEORY COSMOLOGY HUBBLE SANDAGE VARIABLE STARS UF h s variable stars RT SUPERGIANT STARS hubble sequence U HUBBLE CLASSIFICATION HUBBLE TIME RT AGE BIG BANG THEORY COSMOLOGY HUBBLE CONSTANT HYDROCARBONS NT CH ETHANE ETHYLENE POLYCYCLIC HYDROCARBON HYDRODYNAMICS BT FLUID DYNAMICS RT JETS MAGNETOHYDRODYNAMICS HYDROGEN BURNING BT NUCLEOSYNTHESIS NT CARBON NITROGEN CYCLE PROTON PROTON REACTION RT CARBON BURNING CHANDRASEKHAR SCHONBERG LIMIT HELIUM BURNING INNER CORE NUCLEAR FUSION OXYGEN BURNING SHELL BURNING SILICON BURNING STELLAR EVOLUTION STELLAR INTERIORS HYDROGEN DEFICIENT STARS NT AM CANUM VENATICORUM STARS RT METAL ABUNDANCE HYDROGEN LINES See HYDROGEN SPECTRUM HYDROGEN SPECTRUM BT SPECTRA RT BALMER CONTINUUM BALMER LIMIT BALMER SERIES BRACKETT SERIES LYMAN CONTINUUM LYMAN SERIES PASCHEN SERIES PFUND SERIES hydromagnetic waves U MAGNETOHYDRODYNAMICS hydromagnetics U MAGNETOHYDRODYNAMICS HYDROSTATIC EQUILIBRIUM RT STELLAR STRUCTURE HYDROXYL RADICAL Synonym for OH. UF OH radical BT INTERSTELLAR MOLECULES IONS RADICALS RT OH ABSORPTION OH CLOUDS OH EMISSION OH IR STARS OH LINES OH MASERS OH SOURCES HYPERBOLIC ORBITS BT ORBITS RT CIRCULAR ORBITS ELLIPTICAL ORBITS PARABOLIC ORBITS HYPERFINE LINES RT SPECTRA HYPERGALAXIES BT GALAXIES HYPERGIANT STARS RT SUPERGIANT STARS HYPOTHETICAL PLANETS BT PLANETS HZ HERCULIS STARS BT LOW MASS STARS NEUTRON STARS X RAY PULSARS RT X RAY BINARY STARS X RAY BURSTS I MAGNITUDE BT APPARENT MAGNITUDES RT INFRARED PHOTOMETRY JOHNSON PHOTOMETRY NEAR INFRARED RADIATION ice U WATER ICE IDENTIFICATION e.g. Catalog numbers, etc. ILLUMINATION Of solar system bodies RT ALBEDO BRIGHTNESS INTENSITY PHASE [MOON] RADIATION image converters U IMAGE TUBES image intensifiers U IMAGE TUBES IMAGE PROCESSING RT CLEAN METHODS FLAT FIELDS IMAGE RECONSTRUCTION TWO DIMENSIONAL DETECTORS IMAGE RECONSTRUCTION RT CLEAN METHODS IMAGE PROCESSING IMAGE TUBES UF image converters image intensifiers light amplifiers photoelectric image tubes BT MULTICHANNEL DETECTORS PHOTOELECTRIC INSTRUMENTS PHOTOELECTRONIC DEVICES TWO DIMENSIONAL DETECTORS RT AMPLIFIERS ELECTRODES ELECTRONIC CAMERAS INSTRUMENTATION PHOSPHORESCENCE PHOSPHORESCENT SCINTILLATION PHOTOCATHODES QUANTUM EFFICIENCY SCINTILLATION COUNTERS IMAGES NT DIGITAL IMAGES PHOTOGRAPHS RT HALATION HARTMANN TEST PHOTOGRAPHY VISION IMAGING INSTRUMENTS Combine with other terms BT INSTRUMENTATION imf U INITIAL MASS FUNCTION IMPACT CRATERS BT CRATERS RT METEORITES IMPERSONAL ASTROLABES BT ASTROLABES INCLINATION BT ORBITAL ELEMENTS RT BINARY STARS NODES INDOCHINITES BT TEKTITES INERTIAL COORDINATE SYSTEM RT INERTIAL REFERENCE FRAME RELATIVITY INERTIAL REFERENCE FRAME RT INERTIAL COORDINATE SYSTEM RELATIVITY INFLATIONARY UNIVERSE BT COSMOLOGY INFRARED Combine with other terms RT INFRARED RADIATION INFRARED ASTRONOMY RT INFRARED RADIATION INFRARED TELESCOPES SATELLITE BORNE INSTRUMENTS INFRARED DETECTORS BT DETECTORS RT PHOTOMETERS INFRARED EMISSION RT THERMAL EMISSION INFRARED GALAXIES UF IRAS galaxies BT GALAXIES INFRARED SOURCES INFRARED OBSERVATORIES See OBSERVATORIES for more RTs. BT OBSERVATORIES RT AIRPLANE BORNE INSTRUMENTS INFRARED SOURCES ROCKET BORNE INSTRUMENTS SPACE OBSERVATORIES INFRARED PHOTOMETRY BT BROAD BAND PHOTOMETRY MEDIUM BAND PHOTOMETRY PHOTOMETRY RT FAR INFRARED RADIATION H MAGNITUDE I MAGNITUDE J MAGNITUDE K MAGNITUDE L MAGNITUDE M MAGNITUDE N MAGNITUDE NEAR INFRARED RADIATION O MAGNITUDE P MAGNITUDE Q MAGNITUDE INFRARED RADIATION BT RADIATION NT BRACKETT SERIES FAR INFRARED RADIATION NEAR INFRARED RADIATION PFUND SERIES PHILLIPS BANDS RT GREENHOUSE EFFECT INFRARED INFRARED ASTRONOMY REMOTE SENSING TERRESTRIAL RADIATION THERMAL RADIATION INFRARED SOURCES NT COCOON STARS EXTREME CARBON STARS FLARE STARS FU ORIONIS STARS HERBIG HARO OBJECTS INFRARED GALAXIES OH IR STARS RT INFRARED OBSERVATORIES STAR FORMATION INFRARED TELESCOPES BT TELESCOPES RT INFRARED ASTRONOMY INFRARED WINDOWS Low absorption in atmosphere. BT ATMOSPHERIC WINDOWS RT OPTICAL WINDOWS RADIO WINDOWS INHOMOGENITIES Combine with other terms INITIAL MASS FUNCTION UF imf RT MASS MASS RATIOS STAR CLUSTERS STELLAR EVOLUTION INNER CORE Central region of stars. RT HELIUM BURNING HYDROGEN BURNING STELLAR EVOLUTION STELLAR INTERIORS INNER PLANETS UF terrestrial planets BT PLANETS RT OUTER PLANETS INSTABILITIES Combine with other terms NT RAYLEIGH TAYLOR INSTABILITY INSTABILITY STRIP RT CEPHEIDS GIANT BRANCH HERTZSPRUNG RUSSELL DIAGRAM STELLAR EVOLUTION INSTRUMENTAL PROFILES BT LINE PROFILES RT EQUIVALENT WIDTHS LINE BROADENING LINE WIDTHS SPECTRAL LINES INSTRUMENTATION Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF astronomical instruments instruments NT ASTROLABES ASTROMETRIC INSTRUMENTS AUXILIARY INSTRUMENTS BLINK COMPARATORS BOLOMETERS CORONAGRAPHS DETECTORS GUIDE SYSTEMS IMAGING INSTRUMENTS INTERFEROMETERS MAGNETOGRAPHS MAGNETOHELIOGRAPHS QUADRANTS SEXTANTS SPECTROMETERS STROBOSCOPES TELESCOPE INSTRUMENTATION RT CALIBRATION ELECTRONIC EQUIPMENT FREQUENCY STANDARDS IMAGE TUBES METROLOGY PERIPHERALS PHOTOMULTIPLIER TUBES SUPPORT SYSTEMS instruments U INSTRUMENTATION INTEGRATED MAGNITUDE UF total magnitude BT MAGNITUDES RT GALAXIES STAR CLUSTERS INTEGRATION TIME RT BRIGHTNESS NOISE SENSITIVITY SIGNAL TO NOISE RATIO INTENSITY Combine with other terms UF specific intensity NT APPARENT INTENSITY RT BRIGHTNESS ILLUMINATION LUMINOSITY MAGNITUDES INTENSITY INTERFEROMETERS BT INTERFEROMETERS OPTICAL INTERFEROMETERS RT MICHELSON INTERFEROMETERS INTERACTING BINARY STARS BT BINARY STARS NT X RAY BINARY STARS RT CATACLYSMIC VARIABLE STARS ECLIPSING BINARY STARS ERUPTIVE BINARY STARS ROCHE LOBE TIDAL FRICTION TIDAL INTERACTION X RAY BRIGHT POINTS INTERACTING GALAXIES BT GALAXIES PECULIAR GALAXIES RT GALAXY ENCOUNTERS GALAXY MERGERS TAILS TIDAL DISTORTION TIDAL FRICTION TIDAL INTERACTION INTERACTIONS NT ELECTROMAGNETIC INTERACTIONS GRAVITATIONAL INTERACTIONS STRONG INTERACTIONS WEAK INTERACTIONS RT NUCLEAR PHYSICS INTERCLOUD GAS BT INTERCLOUD MATTER INTERCLOUD MATTER BT INTERSTELLAR MATTER NT INTERCLOUD GAS INTERFERENCE FILTERS BT FILTERS OPTICAL COMPONENTS OPTICAL FILTERS RT INTERFERENCE [WAVES] OPTICAL FILMS PHOTOMETRY ULTRAVIOLET FILTERS INTERFERENCE FRINGES UF fringe patterns fringes RT INTERFERENCE [WAVES] INTERFEROMETERS INTERFEROMETRY OPTICAL INTERFEROMETRY VISIBILITY FUNCTION INTERFERENCE SPECTROSOCOPY BT SPECTROSCOPY RT INTERFERENCE [WAVES] interference [noise] U NOISE INTERFERENCE [WAVES] NT LIGHT INTERFERENCE RT DIFFRACTION INTERFERENCE FILTERS INTERFERENCE FRINGES INTERFERENCE SPECTROSOCOPY INTERFEROMETRY OPTICAL INTERFEROMETRY RADIO INTERFEROMETRY SHADOW BANDS WAVE MOTION INTERFEROMETERS See also under INTERFEROMETRY BT INSTRUMENTATION NT FABRY PEROT INTERFEROMETERS INTENSITY INTERFEROMETERS LONG BASELINE INTERFEROMETERS OPTICAL INTERFEROMETERS PHASE SWITCHING INTERFEROMETERS RADIO INTERFEROMETERS VERY LONG BASELINE INTERFEROMETERS RT ANTENNAS ARRAYS HETERODYNE INTERFERENCE FRINGES RADIO TELESCOPES TELESCOPE ARRAYS VERY LARGE ARRAYS INTERFEROMETRY See also under INTERFEROMETERS BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES NT LONG BASELINE INTERFEROMETRY OPTICAL INTERFEROMETRY RADIO INTERFEROMETRY SPECKLE INTERFEROMETRY VERY LONG BASELINE INTERFEROMETRY RT ANGULAR DIAMETERS APERTURE SYNTHESIS CORRELATION INTERFERENCE FRINGES INTERFERENCE [WAVES] RADIO ASTROMETRY RESOLUTION VISIBILITY FUNCTION INTERGALACTIC ABSORPTION BT ABSORPTION RT ABSORPTION COEFFICIENT INTERGALACTIC MATTER INTERGALACTIC SPACE INTERSTELLAR ABSORPTION LYMAN ALPHA FOREST REDDENING INTERGALACTIC CLOUDS BT INTERGALACTIC MATTER RT INTERGALACTIC GAS INTERGALACTIC GAS BT INTERGALACTIC MATTER RT INTERGALACTIC CLOUDS INTERGALACTIC MATTER NT DARK MATTER DUST INTERGALACTIC CLOUDS INTERGALACTIC GAS RT CLUSTERS OF GALAXIES COSMIC STRINGS INTERGALACTIC ABSORPTION INTERGALACTIC SPACE INTERPLANETARY MATTER INTERSTELLAR MATTER INTRACLUSTER MATTER INTERGALACTIC SPACE RT GALAXY VOIDS INTERGALACTIC ABSORPTION INTERGALACTIC MATTER INTERIORS Combine with other terms RT PLANETS INTERMEDIATE POPULATION STARS RT POPULATION II STARS STELLAR POPULATIONS INTERMEDIATE TYPE STARS NT F STARS G STARS INTERNAL MOTIONS Combine with other terms BT MOTION INTERPLANETARY DUST BT DUST INTERPLANETARY MATTER NT METEOROIDS RT GRAINS INTERPLANETARY GAS INTERPLANETARY GAS BT INTERPLANETARY MATTER RT INTERPLANETARY DUST INTERPLANETARY GRAINS SOLAR WIND INTERPLANETARY GRAINS BT GRAINS INTERPLANETARY MATTER NT METEOROIDS RT ADSORPTION GRAPHITE INTERPLANETARY GAS INTERPLANETARY MAGNETIC FIELDS BT MAGNETIC FIELDS INTERPLANETARY MATTER UF interplanetary medium NT INTERPLANETARY DUST INTERPLANETARY GAS INTERPLANETARY GRAINS METEOROIDS SOLAR WIND RT CIRCUMSTELLAR MATTER COMETS GEGENSCHEIN HELIOSPHERE INTERGALACTIC MATTER INTERPLANETARY SCINTILLATION INTERSTELLAR MATTER METEORITES MICROMETEORITES MINOR PLANETS ZODIACAL DUST ZODIACAL LIGHT interplanetary medium U INTERPLANETARY MATTER INTERPLANETARY SCINTILLATION BT SCINTILLATION RT INTERPLANETARY MATTER INTERSTELLAR SCINTILLATION IONOSPHERIC SCINTILLATION RADIO SOURCES INTERSTELLAR ABSORPTION UF interstellar extinction BT ABSORPTION NT OH ABSORPTION RT ABSORPTION COEFFICIENT GALACTIC WINDOWS INTERGALACTIC ABSORPTION INTERSTELLAR DUST INTERSTELLAR GAS INTERSTELLAR REDDENING LIGHT ABSORPTION RAYLEIGH SCATTERING REDDENED STARS REDDENING WINDOWS WOLF DIAGRAM INTERSTELLAR BUBBLES Combine with other terms UF bubbles INTERSTELLAR COMMUNICATION RT EXTRATERRESTRIAL LIFE SPACE EXPLORATION INTERSTELLAR DUST BT DUST INTERSTELLAR MATTER RT ADSORPTION DUST CLOUDS GRAINS GRAPHITE INTERSTELLAR ABSORPTION INTERSTELLAR GAS REDDENING interstellar extinction U INTERSTELLAR ABSORPTION INTERSTELLAR GAS BT INTERSTELLAR MATTER RT ABSORPTION HELIOSPHERE INTERSTELLAR ABSORPTION INTERSTELLAR DUST INTERSTELLAR WINDS REDDENING INTERSTELLAR MAGNETIC FIELDS BT MAGNETIC FIELDS RT SPIRAL ARMS INTERSTELLAR MATTER UF interstellar medium NT BOK GLOBULES C II REGIONS DARK CLOUDS DARK MATTER DARK NEBULAE DENSE CLOUDS DENSE MATTER DUST DUST CLOUDS DUST GRAINS DUST NEBULAE FILAMENTS [NEBULAE] GLOBULES GRAINS H I REGIONS H II REGIONS INTERCLOUD MATTER INTERSTELLAR DUST INTERSTELLAR GAS INTERSTELLAR MOLECULES MOLECULAR CLOUDS NEBULAE OH CLOUDS REFLECTION NEBULAE RT CIRCUMSTELLAR MATTER CONTENT OF GALAXIES COSMIC STRINGS INTERGALACTIC MATTER INTERPLANETARY MATTER INTERSTELLAR REDDENING INTERSTELLAR SCINTILLATION MASERS RADIO ABSORPTION RADIO WINDOWS SELECTIVE ABSORPTION SiO MASERS SPIRAL ARMS STROMGREN SPHERE TORI interstellar medium U INTERSTELLAR MATTER INTERSTELLAR MOLECULES Not a complete list of NTs BT INTERSTELLAR MATTER MOLECULES NT AMMONIA CARBON COMPOUNDS CH HYDROXYL RADICAL MOLECULAR HYDROGEN WATER RT COSMOCHEMISTRY GIANT MOLECULAR CLOUDS MOLECULAR CLOUDS ORGANIC MOLECULES INTERSTELLAR REDDENING BT REDDENING RT COLOR EXCESSES GAS TO DUST RATIO INTERSTELLAR ABSORPTION INTERSTELLAR MATTER LIGHT ABSORPTION LIGHT SCATTERING REDDENED STARS REDDENING LAW SELECTIVE ABSORPTION INTERSTELLAR SCINTILLATION BT SCINTILLATION RT INTERPLANETARY SCINTILLATION INTERSTELLAR MATTER IONOSPHERIC SCINTILLATION RADIO SOURCES INTERSTELLAR WINDS RT INTERSTELLAR GAS SOLAR WIND STELLAR WINDS INTRACLUSTER MATTER RT CLUSTERS OF GALAXIES INTERGALACTIC MATTER SUNYAEV ZELDOVICH EFFECT INTRINSIC COLORS RT COLOR INDICES PHOTOMETRY REDDENING INTRINSIC VARIABLE STARS UF unstable stars BT VARIABLE STARS NT HERBIG HARO OBJECTS MAGNETIC VARIABLE STARS PULSATING VARIABLE STARS SPECTRUM VARIABLE STARS INVERSE COMPTON EFFECT RT COSMIC RAYS ELECTRONS HIGH ENERGY ASTROPHYSICS PHOTONS INVERSE COMPTON SCATTERING RT COMPTON SCATTERING ELECTRONS PHOTONS INVERSE MASERS RT MASERS ION COMPOSITION RT IONS ION DENSITY RT IONIZATION IONS ION PLASMA WAVES RT IONS PLASMA WAVES ION TEMPERATURE BT TEMPERATURE IONIZATION NT PHOTOIONIZATION RT CORONAS ION DENSITY IONIZATION EQUILIBRIUM SCHWARZSCHILD METRIC SHOCKS STROMGREN SPHERE IONIZATION EQUILIBRIUM RT IONIZATION IONIZED GASES BT GASES RT COLLISIONAL EXCITATION IONS PLASMAS STROMGREN SPHERE IONIZING SHOCK WAVES BT SHOCK WAVES IONOSPHERE RT D LAYER E LAYER EARTH ATMOSPHERE EXOSPHERE F LAYER IONOSPHERIC SCINTILLATION MESOPAUSE RADIO ABSORPTION THERMOSPHERE UPPER ATMOSPHERE IONOSPHERIC SCINTILLATION BT SCINTILLATION RT INTERPLANETARY SCINTILLATION INTERSTELLAR SCINTILLATION IONOSPHERE RADIO SOURCES IONS UF charged particles BT COMPOSITE PARTICLES PARTICLES NT HYDROXYL RADICAL RT COLLISIONAL EXCITATION COLLISIONAL PLASMAS ION COMPOSITION ION DENSITY ION PLASMA WAVES IONIZED GASES PAUL TRAP PLASMA CLOUDS PLASMA JETS PLASMAS POLARIZATION [CHARGE SEPARATION] RADICALS SAHA EQUATION THERMIONIC EMISSION IRAS galaxies U INFRARED GALAXIES IRON METEORITES BT METEORITES IRRADIANCE RT RADIATION IRREGULAR GALAXIES BT GALAXIES NT MAGELLANIC CLOUDS IRREGULAR VARIABLE STARS BT LATE TYPE GIANT STARS PULSATING VARIABLE STARS VARIABLE STARS NT DWARF CEPHEIDS GAMMA CASSIOPEIAE STARS MIRA VARIABLE STARS R CORONAE BOREALIS STARS RV TAURI STARS RW AURIGAE STARS T TAURI STARS RT LATE TYPE SUPERGIANT STARS SEMIREGULAR VARIABLE STARS SUPERGIANT STARS T ASSOCIATIONS ISOPHOTES RT CONTOUR MAPS LUMINOSITY DISTRIBUTION SURFACE PHOTOMETRY ISOTOPES BT CHEMICAL ELEMENTS ISOTOPIC ABUNDANCE BT ABUNDANCE RT ISOTOPIC COMPOSITION ISOTOPIC COMPOSITION RT ISOTOPIC ABUNDANCE ISOTROPY RT ANISOTROPY OPTICAL PROPERTIES J MAGNITUDE BT APPARENT MAGNITUDES RT INFRARED PHOTOMETRY NEAR INFRARED RADIATION JANSKY Radio flux density unit RT RADIO RADIATION JEANS LENGTH RT GRAVITY JEANS MASS STAR FORMATION JEANS MASS RT JEANS LENGTH JETS UF astrophysical jets NT PLASMA JETS RADIO JETS RT COMETS HYDRODYNAMICS RADIO SOURCES johnson morgan system U JOHNSON PHOTOMETRY JOHNSON NOISE RT THERMAL RADIATION JOHNSON PHOTOMETRY UF johnson morgan system three color photometry UBV photometry UBVRI photometry BT BROAD BAND PHOTOMETRY PHOTOMETRIC SYSTEMS RT B MAGNITUDE BV PHOTOMETRY CAPE PHOTOMETRY CAPE RI PHOTOMETRY E REGIONS F REGIONS I MAGNITUDE R MAGNITUDE TWO COLOR PHOTOMETRY U MAGNITUDE UBVRIJKL PHOTOMETRY V MAGNITUDE jovian planets U OUTER PLANETS JULIAN CALENDAR BT CALENDARS RT GREGORIAN CALENDAR JULIAN DATE JULIAN EPOCH JULIAN DATE NT HELIOCENTRIC JULIAN DATE RT EPOCH JULIAN CALENDAR TIME JULIAN EPOCH BT EPOCH STANDARD EPOCH RT BESSELIAN EPOCH JULIAN CALENDAR TIME JUMP CONDITIONS RT SHOCK WAVES K CORONA BT CORONAS RT SOLAR CORONA K CORRECTION UF k term RT REDSHIFT K DWARF STARS BT DWARF STARS K STARS LATE TYPE DWARF STARS RT K SUBDWARF STARS K GIANT STARS BT K STARS LATE TYPE GIANT STARS RT K SUBGIANT STARS K LINE BT CALCIUM LINES FRAUNHOFER LINES H AND K LINES RT H LINE WILSON BAPPU EFFECT K MAGNITUDE BT APPARENT MAGNITUDES RT INFRARED PHOTOMETRY NEAR INFRARED RADIATION K STARS BT LATE TYPE STARS NT K DWARF STARS K GIANT STARS K SUBDWARF STARS K SUBGIANT STARS K SUPERGIANT STARS RT SPECTRAL TYPES K SUBDWARF STARS BT K STARS SUBDWARF STARS RT K DWARF STARS K SUBGIANT STARS BT K STARS SUBGIANT STARS RT K GIANT STARS K SUPERGIANT STARS BT K STARS LATE TYPE SUPERGIANT STARS SUPERGIANT STARS k term U K CORRECTION KAPPA MECHANISM RT CEPHEIDS DELTA SCUTI STARS HE+ IONIZATION ZONE PULSATING VARIABLE STARS ZZ CETI STARS KAPTEYN SELECTED AREAS NT E REGIONS F REGIONS RT CAPE PHOTOMETRY STROMGREN PHOTOMETRY KELLNER EYEPIECE BT EYEPIECES KELVIN Absolute temperature scale units. RT ABSOLUTE TEMPERATURE SCALE CELSIUS TEMPERATURE SCALE TEMPERATURE SCALES kelvin helmholtz contraction U HELMHOLTZ KELVIN CONTRACTION KELVIN TIMESCALE RT HELMHOLTZ KELVIN CONTRACTION KEPLERIAN ORBITS BT ORBITS RT CELESTIAL MECHANICS KERR BLACK HOLE BT BLACK HOLES RT STELLAR EVOLUTION KINEMATIC PARALLAX BT PARALLAXES RT DYNAMICAL PARALLAX MOVING CLUSTER PARALLAX KINEMATICS NT ACCELERATION RT ANGULAR MOMENTUM GALACTIC ROTATION GALACTIC STRUCTURE PROPER MOTIONS RADIAL VELOCITY VELOCITY KINETIC ENERGY BT ENERGY RT POTENTIAL ENERGY KIRKWOOD GAPS BT RESONANCE GAPS RT MINOR PLANETS KRAMERS OPACITY BT OPACITY RT ROSSELAND OPACITY KREUTZ SUNGRAZERS UF sungrazers BT COMETS RT SOLAR SYSTEM KRUSKAL DIAGRAM RT BLACK HOLES L MAGNITUDE BT APPARENT MAGNITUDES RT INFRARED PHOTOMETRY NEAR INFRARED RADIATION LAGRANGIAN POINTS UF libration points RT CELESTIAL MECHANICS GRAVITATION GRAVITATIONAL FIELDS LAMBDA ERIDANI STARS BT Be STARS PULSATING VARIABLE STARS LARGE MAGELLANIC CLOUD UF lmc BT MAGELLANIC CLOUDS RT SMALL MAGELLANIC CLOUD LARGE SCALE STRUCTURE RT COSMIC STRINGS UNIVERSE LASER RANGING NT LUNAR LASER RANGING SATELLITE LASER RANGING RT OPTICAL RADAR LASERS RT COHERENCE ELECTRON PUMPING LIGHT COHERENCE LUNAR LASER RANGING MASERS OPTICAL RADAR POPULATION INVERSION SATELLITE LASER RANGING STIMULATED EMISSION LATE TYPE DWARF STARS UF cool dwarf stars BT DWARF STARS LATE TYPE STARS LOW LUMINOSITY STARS NT K DWARF STARS M DWARF STARS RED DWARF FLARE STARS LATE TYPE GALAXIES BT GALAXIES RT SPIRAL GALAXIES LATE TYPE GIANT STARS UF cool giant stars BT GIANT STARS LATE TYPE STARS NT CARBON STARS HEAVY METAL STARS IRREGULAR VARIABLE STARS K GIANT STARS M GIANT STARS MIRA VARIABLE STARS SEMIREGULAR VARIABLE STARS RT ASYMPTOTIC GIANT BRANCH FUNNELING RED GIANT TIP LATE TYPE STARS UF cool stars NT K STARS LATE TYPE DWARF STARS LATE TYPE GIANT STARS LATE TYPE SUBDWARF STARS LATE TYPE SUPERGIANT STARS M STARS N STARS R STARS S STARS RT MOLECULAR BANDS MOLECULAR LINES MOLECULAR SPECTRA WILSON BAPPU EFFECT LATE TYPE SUBDWARF STARS UF cool subdwarf stars BT LATE TYPE STARS LOW LUMINOSITY STARS LATE TYPE SUPERGIANT STARS UF cool supergiant stars BT LATE TYPE STARS SUPERGIANT STARS NT K SUPERGIANT STARS M SUPERGIANT STARS RV TAURI STARS RT IRREGULAR VARIABLE STARS LONG PERIOD VARIABLE STARS LATE TYPE VARIABLE STARS NT Me VARIABLE STARS RT Me STARS LATITUDE On earth surface. latitude On celestial sphere. U ECLIPTIC LATITUDE GALACTIC LATITUDE LATITUDE DETERMINATION On earth surface. NT LATITUDE VARIATION RT ASTROMETRY CHANDLER WOBBLE LATITUDE VARIATION On earth surface. BT LATITUDE DETERMINATION RT CHANDLER WOBBLE POLAR MOTION Lb VARIABLE STARS BT GIANT STARS Lc VARIABLE STARS RT SUPERGIANT STARS LEMAITRE UNIVERSE BT COSMOLOGY RT BIG BANG THEORY LENS ANTENNAS BT ANTENNAS LENS DESIGN RT LENSES LENSES BT OPTICAL COMPONENTS NT CAMERA LENSES CORRECTOR PLATES FIELD CORRECTORS PRIMARY LENSES RT ABERRATIONS ANTIREFLECTION COATINGS CATADIOPTRIC SYSTEMS COATINGS COLLIMATORS DIOPTRIC SYSTEMS EYEPIECES FIGURING GLASS LENS DESIGN OPTICAL INSTRUMENTS OPTICAL MATERIALS POLISHING REFRACTION REFRACTIVE INDEX SURFACES [OPTICAL] LENTICULAR GALAXIES UF S0 galaxies BT GALAXIES RT ANSAE LEPTONS BT ELEMENTARY PARTICLES PARTICLES NT ELECTRONS MUONS NEUTRINOS POSITRONS RT BOSONS QUARKS Li stars U LITHIUM STARS LIBRATION UF physical libration RT MOON libration points U LAGRANGIAN POINTS LIFE RT ANTHROPIC PRINCIPLE EXTRATERRESTRIAL LIFE ORIGIN LIGHT Combine with other terms Synonym: VISIBLE RADIATION. BT ELECTROMAGNETIC WAVES NT POLARIZED LIGHT RT COLOR DARKNESS GRAVITATIONAL LENSES LIGHT ABSORPTION LIGHT INTERFERENCE LIGHT SCATTERING LUMINESCENCE REFRACTION VISIBLE RADIATION VISIBLE SPECTRUM LIGHT ABSORPTION BT ABSORPTION RT ATMOSPHERIC EXTINCTION INTERSTELLAR ABSORPTION INTERSTELLAR REDDENING LIGHT LIGHT SCATTERING light amplifiers U IMAGE TUBES LIGHT COHERENCE BT COHERENCE RT LASERS LIGHT CONE NT FUTURE LIGHT CONE PAST LIGHT CONE RT VELOCITY OF LIGHT LIGHT CURVES BT PHOTOMETRIC ELEMENTS RT MAGNITUDES MAXIMA MINIMA PERIOD PHASE SHIFT PHASE [WAVE] VARIABLE STARS VELOCITY CURVES LIGHT EMISSION NT PHOTOLUMINESCENCE RT AURORAS CHEMILUMINESCENCE CONTINUOUS SPECTRA EMISSION SPECTRA LUMINESCENCE LIGHT INTERFERENCE BT INTERFERENCE [WAVES] RT LIGHT OPTICAL FILMS OPTICAL FILTERS OPTICAL INTERFEROMETRY light interferometry U OPTICAL INTERFEROMETRY light polarization U POLARIZATION [WAVES] LIGHT POLLUTION BT POLLUTION RT AIR POLLUTION SITE PROTECTION LIGHT SCATTERING BT RADIATION SCATTERING SCATTERING NT COMPTON SCATTERING RAYLEIGH SCATTERING THOMSON SCATTERING RT AFTERGLOW ATMOSPHERIC EXTINCTION BRILLOUIN SPECTRA HALOS INTERSTELLAR REDDENING LIGHT LIGHT ABSORPTION LUMINESCENCE RAMAN SPECTRA ZODIACAL LIGHT LIGHT YEAR RT DISTANCE PARSEC VELOCITY OF LIGHT YEAR LIMB BRIGHTENING RT ATMOSPHERES LIMB DARKENING STELLAR ATMOSPHERES TEMPERATURE LIMB DARKENING RT ATMOSPHERES LIMB BRIGHTENING SOLAR ATMOSPHERE STELLAR ATMOSPHERES TEMPERATURE LIMITING MAGNITUDES RT DETECTORS PRECISION SENSITIVITY SIGNAL DETECTION SIGNAL TO NOISE RATIO LINE BLANKETING RT METAL LINES SPECTRAL LINES ULTRAVIOLET RADIATION LINE BLENDING RT SPECTRAL LINES SPECTRAL RESOLUTION LINE BLOCKING See under LINE BLANKETING. LINE BROADENING UF spectral line broadening NT COLLISION BROADENING DOPPLER BROADENING NATURAL LINE BROADENING PRESSURE BROADENING STARK BROADENING RT CONVECTION EQUIVALENT WIDTHS INSTRUMENTAL PROFILES LINE FORMATION LINE WIDTHS NATURAL LINE WIDTH SPECTRAL LINES STELLAR ATMOSPHERES TURBULENCE [STAR ATMOSPHERE] ZEEMAN SPLITTING LINE FORMATION UF spectral line formation RT ABSORPTION LINES DAMPING CONSTANTS EMISSION LINES LINE BROADENING OSCILLATOR STRENGTHS SOLAR ATMOSPHERE SPECTRAL LINES STELLAR ATMOSPHERES TRANSITION PROBABILITIES LINE IDENTIFICATIONS RT ABSORPTION LINES EMISSION LINES SPECTRAL LINES LINE INTENSITITES RT EMISSION LINES SPECTRAL LINES line of nodes U NODES LINE PROFILES UF profiles NT INSTRUMENTAL PROFILES P CYGNI LINE PROFILES RT ABSORPTION LINES EMISSION LINES RESIDUAL INTENSITY SPECTRAL LINES LINE RATIOS RT ABSORPTION LINES EMISSION LINES SPECTRAL LINES LINE SHIFT UF spectral line shift NT BLUE SHIFT REDSHIFT RT DOPPLER EFFECT RADIAL VELOCITY ZEEMAN SPLITTING LINE SPECTRA NT ABSORPTION SPECTRA EMISSION SPECTRA RT PRESSURE BROADENING ULTRAVIOLET LINES VOIGT PROFILES line splitting U ZEEMAN SPLITTING LINE WIDTHS UF spectral line widths NT EQUIVALENT WIDTHS NATURAL LINE WIDTH RT DOPPLER BROADENING INSTRUMENTAL PROFILES LINE BROADENING MILNE EDDINGTON APPROXIMATION OSCILLATOR STRENGTHS SPECTRAL TYPES STELLAR ATMOSPHERES SURFACE GRAVITY TRANSITION PROBABILITIES TULLY FISHER RELATION LITHIUM POOR STARS BT METAL POOR STARS lithium rich stars U LITHIUM STARS LITHIUM STARS UF Li stars lithium rich stars RT GIANT STARS LITHOSPHERES RT MANTLES PLANETS lmc U LARGE MAGELLANIC CLOUD LOBES Radio source features. BT RADIO STRUCTURE RT RADIO SOURCES lobes [telescope beams] U SIDELOBES LOCAL GROUP OF GALAXIES BT GROUPS OF GALAXIES NEARBY GALAXIES NT MAGELLANIC CLOUDS MILKY WAY GALAXY RT BRIGHT GALAXIES LOCAL STANDARD OF REST UF lsr RT ORBITS PECULIAR MOTIONS PECULIAR VELOCITY PROPER MOTIONS STELLAR MOTIONS SUN LOCAL SUPERCLUSTER BT CLUSTERS OF GALAXIES RT GALAXIES GREAT ATTRACTOR LOCAL THERMODYNAMIC EQUILIBRIUM UF lte BT THERMODYNAMIC EQUILIBRIUM RT NONLTE TRANSFER THERMAL EQUILIBRIUM THERMAL INSTABILITY THERMAL STABILITY THERMODYNAMICS LONG BASELINE INTERFEROMETERS BT INTERFEROMETERS RADIO INTERFEROMETERS RT OPTICAL INTERFEROMETERS VERY LONG BASELINE INTERFEROMETERS LONG BASELINE INTERFEROMETRY BT INTERFEROMETRY RADIO INTERFEROMETRY RT OPTICAL INTERFEROMETRY RADIO ASTROMETRY VERY LONG BASELINE INTERFEROMETRY LONG PERIOD COMETS BT COMETS LONG PERIOD VARIABLE STARS BT PULSATING VARIABLE STARS NT MIRA VARIABLE STARS RV TAURI STARS S VULPECULAE STARS WZ SAGITTAE STARS RT LATE TYPE SUPERGIANT STARS LONG SLIT SPECTRA RT TWO DIMENSIONAL SPECTRA LONGITUDE On earth surface. longitude On celestial sphere. U ECLIPTIC LONGITUDE GALACTIC LONGITUDE LOOPS Combine with other terms LOW LUMINOSITY STARS NT LATE TYPE DWARF STARS LATE TYPE SUBDWARF STARS RT DWARF STARS LOW MASS STARS LOW MASS STARS NT BLACK DWARF STARS BROWN DWARF STARS HZ HERCULIS STARS RT DWARF STARS LOW LUMINOSITY STARS LOW TEMPERATURE PLASMAS BT PLASMAS lsr U LOCAL STANDARD OF REST lte U LOCAL THERMODYNAMIC EQUILIBRIUM LUMINESCENCE UF candoluminescence NT CHEMILUMINESCENCE THERMOLUMINESCENCE RT AFTERGLOW FLUORESCENCE LIGHT LIGHT EMISSION LIGHT SCATTERING NOCTILUCENT CLOUDS LUMINOSITY UF absolute intensity NT ULTRAVIOLET LUMINOSITY X RAY LUMINOSITY RT ABSOLUTE MAGNITUDE BRIGHTNESS FLUX FLUX DENSITY HERTZSPRUNG RUSSELL DIAGRAM INTENSITY LUMINOSITY CLASS MASS TO LIGHT RATIOS MK CLASSIFICATION SURFACE GRAVITY LUMINOSITY CLASS See: LUMINOSITY CLASSIFICATION BT MK CLASSIFICATION RT LUMINOSITY LUMINOSITY CLASSIFICATION SPECTRAL TYPES LUMINOSITY CLASSIFICATION BT CLASSIFICATION RT DWARF STARS GIANT STARS LUMINOSITY CLASS SPECTRAL CLASSIFICATION SPECTRAL TYPES SUBGIANT STARS SURFACE GRAVITY LUMINOSITY DISTRIBUTION RT BRIGHTNESS TEMPERATURE ISOPHOTES LUMINOSITY FUNCTION RT CLUSTERS OF GALAXIES STAR CLUSTERS STELLAR EVOLUTION LUMINOUS ARCS UF arcs RT GRAVITATIONAL LENSES QUASARS LUMINOUS BLUE VARIABLE STARS BT EARLY TYPE VARIABLE STARS HIGH LUMINOSITY STARS RT EARLY TYPE SUPERGIANT STARS luminous stars U HIGH LUMINOSITY STARS LUNAR Combine LUNAR or MOON with other terms. Also see MOON. LUNAR DOMES RT MOON SURFACES [CELESTIAL BODIES] LUNAR ECLIPSE BT ECLIPSES RT MOON PENUMBRA SAROS CYCLE SUN UMBRA LUNAR LASER RANGING BT LASER RANGING RT LASERS MOON OPTICAL RADAR SATELLITE LASER RANGING lunar phases U PHASE [MOON] LUNAR THEORY RT CELESTIAL MECHANICS EARTH MOON SYSTEM MOON LYMAN ALPHA BT RESONANCE LINES RT LYMAN ALPHA FOREST LYMAN CONTINUUM LYMAN SERIES LYMAN ALPHA FOREST RT ABSORPTION LINES INTERGALACTIC ABSORPTION LYMAN ALPHA QUASARS REDSHIFT LYMAN BETA RT LYMAN CONTINUUM LYMAN SERIES LYMAN CONTINUUM RT HYDROGEN SPECTRUM LYMAN ALPHA LYMAN BETA LYMAN SERIES ULTRAVIOLET RADIATION LYMAN SERIES RT BALMER SERIES BRACKETT SERIES HYDROGEN SPECTRUM LYMAN ALPHA LYMAN BETA LYMAN CONTINUUM PASCHEN SERIES PFUND SERIES ULTRAVIOLET RADIATION M DWARF STARS BT DWARF STARS LATE TYPE DWARF STARS M STARS M GIANT STARS BT GIANT STARS LATE TYPE GIANT STARS M STARS NT Me VARIABLE STARS RT M SUBGIANT STARS M MAGNITUDE BT APPARENT MAGNITUDES RT FAR INFRARED RADIATION INFRARED PHOTOMETRY M REGIONS BT SOLAR CORONA M STARS BT LATE TYPE STARS NT M DWARF STARS M GIANT STARS M SUBDWARF STARS M SUBGIANT STARS M SUPERGIANT STARS Me STARS RT SPECTRAL TYPES M SUBDWARF STARS BT M STARS SUBDWARF STARS M SUBGIANT STARS BT M STARS SUBGIANT STARS RT M GIANT STARS M SUPERGIANT STARS BT LATE TYPE SUPERGIANT STARS M STARS MACRO SPICULES BT SPICULES RT CHROMOSPHERE SUN MACROTURBULENCE BT TURBULENCE [EARTH ATMOSPHERE] TURBULENCE [STAR ATMOSPHERE] RT ATMOSPHERES STELLAR STRUCTURE MAGELLANIC CLOUDS UF clouds of magellan BT GALAXIES IRREGULAR GALAXIES LOCAL GROUP OF GALAXIES NEARBY GALAXIES NT LARGE MAGELLANIC CLOUD SMALL MAGELLANIC CLOUD RT MAGELLANIC STREAM MAGELLANIC STREAM RT MAGELLANIC CLOUDS MAGNETIC ANOMALIES BT ANOMALIES RT GRAVITY ANOMALIES MAGNETIC PROPERTIES MAGNETIC DISTURBANCES RT AURORAS MAGNETIC PROPERTIES MAGNETIC FIELDS NT GEOMAGNETIC FIELD INTERPLANETARY MAGNETIC FIELDS INTERSTELLAR MAGNETIC FIELDS RT DYNAMO THEORY FORCE MAGNETIC MONOPOLES MAGNETIC POLES MAGNETIC PROPERTIES MAGNETIC VARIABLE STARS MAGNETOHYDRODYNAMICS MAGNETOSPHERE PALEOMAGNETISM PASCHEN BACK EFFECT SUNSPOTS MAGNETIC MONOPOLES RT MAGNETIC FIELDS MAGNETIC POLES MAGNETIC POLES RT AURORAS MAGNETIC FIELDS MAGNETIC MONOPOLES MAGNETIC STORMS MAGNETIC VARIABLE STARS MAGNETIC PROPERTIES BT PROPERTIES RT MAGNETIC ANOMALIES MAGNETIC DISTURBANCES MAGNETIC FIELDS MAGNETIC STARS MAGNETIC STARS UF cobalt stars BT PECULIAR STARS NT Am STARS Bp STARS MAGNETIC VARIABLE STARS MANGANESE STARS MERCURY MANGANESE STARS RT Ap STARS MAGNETIC PROPERTIES OBLIQUE ROTATORS SPECTRUM VARIABLE STARS STRONTIUM STARS MAGNETIC STORMS NT MAGNETOSPHERIC SUBSTORMS RT AURORAS MAGNETIC POLES MAGNETOSPHERE SOLAR ACTIVITY SUNSPOTS MAGNETIC VARIABLE STARS BT INTRINSIC VARIABLE STARS MAGNETIC STARS NT ALPHA2 CANUM VENATICORUM STARS Am STARS SX ARIETIS STARS RT Ap STARS MAGNETIC FIELDS MAGNETIC POLES MAGNETO OPTICAL EFFECTS NT FARADAY EFFECT POLARIZATION [CHARGE SEPARATION] ZEEMAN SPLITTING MAGNETOGRAPHS BT INSTRUMENTATION MAGNETOHELIOGRAPHS BT INSTRUMENTATION MAGNETOHYDRODYNAMICS UF alfven waves hydromagnetic waves hydromagnetics mhd RT COSMIC ELECTRODYNAMICS HYDRODYNAMICS MAGNETIC FIELDS PLASMA PHYSICS PLASMA WAVES SYNCHROTRON RADIATION VAN ALLEN RADIATION BELTS MAGNETOSPHERE RT EARTH ATMOSPHERE EXOSPHERE MAGNETIC FIELDS MAGNETIC STORMS MAGNETOSPHERIC SUBSTORMS UPPER ATMOSPHERE MAGNETOSPHERIC SUBSTORMS BT MAGNETIC STORMS RT MAGNETOSPHERE MAGNITUDES Also see under APPARENT MAGNITUDES NT ABSOLUTE MAGNITUDE APPARENT MAGNITUDES INTEGRATED MAGNITUDE RT AMPLITUDES BRIGHTNESS INTENSITY LIGHT CURVES PHOTOMETRY POGSON SCALE MAINSEQUENCE RT DWARF STARS HERTZSPRUNG RUSSELL DIAGRAM MAINSEQUENCE STARS TURNOFF POINT ZERO AGE MAINSEQUENCE MAINSEQUENCE STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT BLUE STRAGGLER STARS DWARF STARS RT MAINSEQUENCE MASS LUMINOSITY RELATION MAJOR AXIS See terms under SEMIMAJOR AXIS. MAKSUTOV TELESCOPES BT CATADIOPTRIC SYSTEMS REFLECTING TELESCOPES RT BOUWERS TELESCOPES SCHMIDT TELESCOPES WIDE FIELD TELESCOPES MANGANESE STARS BT Ap STARS MAGNETIC STARS SPECTRUM VARIABLE STARS MANTLES RT CRUST CRUSTAL DYNAMICS EARTH LITHOSPHERES MOON PLANETS many body problem U N BODY PROBLEM MAPS NT CONTOUR MAPS X RAY MAPS RT ATLASES CATALOGS FINDING CHARTS PHOTOGRAMMETRY PLANETS RADAR MAPPING SKY SURVEYS STAR ATLASES MARIA RT MOON SURFACES [CELESTIAL BODIES] MARKARIAN GALAXIES BT EMISSION LINE GALAXIES RT PECULIAR GALAXIES SEYFERT GALAXIES MASCONS RT GRAVITY ANOMALIES MOON MASERS NT MEGAMASERS OH MASERS SiO MASERS WATER MASERS RT COHERENCE ELECTRON PUMPING INTERSTELLAR MATTER INVERSE MASERS LASERS POPULATION INVERSION RADIO RECOMBINATION LINES RADIO SOURCES STIMULATED EMISSION MASS RT CHANDRASEKHAR LIMIT CHANDRASEKHAR SCHONBERG LIMIT GRAVITATION INITIAL MASS FUNCTION MASS DENSITY MASS EXCHANGE MASS FLOW MASS FUNCTION MASS TO LIGHT RATIOS MOMENTUM SPECTROSCOPIC BINARY STARS SURFACE GRAVITY MASS DENSITY BT DENSITY RT MASS mass ejection U MASS LOSS MASS EXCHANGE UF exchange of mass RT CATACLYSMIC VARIABLE STARS CONTACT BINARY STARS ERUPTIVE BINARY STARS MASS MASS FLOW MASS LOSS MASS TRANSFER MASS FLOW RT MASS MASS EXCHANGE MASS LOSS MASS TRANSFER MASS FUNCTION RT BIRTH RATES MASS MASS RATIOS SPECTROSCOPIC BINARY STARS STAR CLUSTERS STAR COUNTS MASS LOSS UF mass ejection RT BINARY STARS CATACLYSMIC VARIABLE STARS CIRCUMSTELLAR DISKS CIRCUMSTELLAR ENVELOPES CIRCUMSTELLAR MATTER CIRCUMSTELLAR SHELLS CORONAL MASS EJECTIONS CORONAS ERUPTIVE BINARY STARS FU ORIONIS STARS MASS EXCHANGE MASS FLOW MASS TRANSFER MASSIVE STARS NOVAS P CYGNI LINE PROFILES PLANETARY NEBULAE STELLAR EVOLUTION STELLAR WINDS SUPERNOVAS WOLF RAYET STARS MASS LUMINOSITY RELATION RT MAINSEQUENCE STARS MASS RADIUS RELATION RT CHANDRASEKHAR LIMIT DEGENERATE STARS MASS RATIOS RT BINARY STARS INITIAL MASS FUNCTION MASS FUNCTION MASS TO LIGHT RATIOS RT GALAXIES LUMINOSITY MASS MISSING MASS MASS TRANSFER RT ACCRETION CONVECTION FLUID DYNAMICS MASS EXCHANGE MASS FLOW MASS LOSS MASSIVE GALAXIES RT cD GALAXIES CLUSTERS OF GALAXIES D GALAXIES MASSIVE OBJECTS RT BLACK HOLES GALACTIC NUCLEI SEYFERT GALAXIES MASSIVE STARS RT MASS LOSS SUPERMASSIVE STARS MATHEMATICAL ANALYSIS Combine with other terms NT DIFFERENTIAL EQUATIONS RT CATASTROPHE THEORY mathematical models U COMPUTER MODELS MATHEMATICS Combine with other terms MATTER Combine with other terms MAUNDER MINIMUM RT SOLAR ACTIVITY SUNSPOT CYCLE SUNSPOT NUMBERS MAXIMA BT PHOTOMETRIC ELEMENTS RT LIGHT CURVES MINIMA VARIABLE STARS VELOCITY CURVES MAXIMUM ENTROPY METHODS RT FOURIER ANALYSIS FREQUENCY ANALYSIS SPECTROSCOPIC ANALYSIS Me STARS BT EMISSION LINE STARS M STARS RT LATE TYPE VARIABLE STARS Me VARIABLE STARS Me VARIABLE STARS BT EMISSION LINE STARS LATE TYPE VARIABLE STARS M GIANT STARS RT Me STARS mean anomaly U ANOMALY MEAN EQUINOX BT EQUINOXES RT PLANETS MEAN SOLAR TIME BT TIME RT CIVIL TIME EPHEMERIS TIME EQUATION OF TIME UNIVERSAL TIME MEASUREMENT Combine with other terms RT DETERMINATION MEASURING INSTRUMENTS METROLOGY QUANTIZATION MEASURING INSTRUMENTS NT ALTIMETERS ATOMIC CLOCKS CHRONOMETERS CLOCKS COUNTERS DENSITOMETERS HELIOMETERS MICRODENSITOMETERS MICROMETERS MICROPHOTOMETERS MONOCHROMATORS PROPORTIONAL COUNTERS RADIOMETERS RANGE FINDERS SENSITOMETERS RT CALIBRATION MEASUREMENT MECHANICAL COMPONENTS Combine with other terms MECHANICAL PROPERTIES Combine with other terms BT PROPERTIES MEDIUM BAND PHOTOMETRY BT CCD PHOTOMETRY PHOTOELECTRIC PHOTOMETRY NT DDO PHOTOMETRY GENEVA PHOTOMETRY INFRARED PHOTOMETRY STROMGREN PHOTOMETRY ULTRAVIOLET PHOTOMETRY VILNIUS PHOTOMETRY WALRAVEN PHOTOMETRY RT BROAD BAND PHOTOMETRY NARROW BAND PHOTOMETRY MEGALITHIC ASTRONOMY BT ARCHAEOASTRONOMY MEGAMASERS BT MASERS MERCURY MANGANESE STARS BT B STARS MAGNETIC STARS mergers U GALAXY MERGERS MERIDIAN CIRCLES BT TRANSIT INSTRUMENTS RT ASTROMETRY QUADRANTS VERTICAL CIRCLES MERIDIAN OBSERVATIONS RT TRANSIT INSTRUMENTS TRANSIT TELESCOPES TRANSIT TIME ZENITH TELESCOPES MESONS BT BOSONS ELEMENTARY PARTICLES RT PHOTONS QUARKS MESOPAUSE RT EARTH ATMOSPHERE IONOSPHERE MESOSPHERE THERMOSPHERE MESOSPHERE RT EARTH ATMOSPHERE MESOPAUSE STRATOPAUSE UPPER ATMOSPHERE METAGALAXY RT UNIVERSE METAL ABUNDANCE UF metallicity BT ABUNDANCE RT CNO ANOMALIES DREDGE UP HELIUM POOR STARS HELIUM RICH STARS HYDROGEN DEFICIENT STARS METAL DEFICIENT STARS METAL POOR STARS METAL RICH STARS OOSTERHOFF GROUPS RARE EARTHS TRACE ELEMENTS METAL DEFICIENT STARS RT METAL ABUNDANCE METAL POOR STARS ULTRAVIOLET EXCESS STARS METAL LINES BT SPECTRAL LINES NT Ca II EMISSION LINES CALCIUM LINES CARBON LINES TECHNETIUM LINES RT ABSORPTION LINES LINE BLANKETING RARE EARTHS METAL POOR STARS NT LITHIUM POOR STARS WEAK G BAND STARS RT METAL ABUNDANCE METAL DEFICIENT STARS ULTRAVIOLET EXCESS STARS METAL RICH STARS UF metallic line stars NT Am STARS SILICON STARS RT METAL ABUNDANCE metallic line stars U METAL RICH STARS metallicity U METAL ABUNDANCE METEOR CAMERAS NT BAKER NUNN CAMERAS METEOR SHOWERS Named showers not included. RT METEOR STREAMS METEOR TRAILS METEORS RADIANT [METEORS] ZENITH HOURLY RATE METEOR STREAMS RT COMETS METEOR SHOWERS METEOR TRAILS METEORS MINOR PLANETS RADIANT [METEORS] METEOR TRAILS RT METEOR SHOWERS METEOR STREAMS METEORS RADIANT [METEORS] meteorids U METEOROIDS METEORITE CRATERS RT METEORITE IMPACTS METEORITES METEORS METEORITE IMPACTS RT METEORITE CRATERS METEORITES METEORS METEORITES BT METEORS NT ACHONDRITES AEROLITES ATAXITES AUSTRALITES BEDIASITES CHONDRITES IRON METEORITES MICROMETEORITES MOLDAVITES TEKTITES RT ABLATION COLLISIONS COMETS IMPACT CRATERS INTERPLANETARY MATTER METEORITE CRATERS METEORITE IMPACTS MINOR PLANETS NEUMANN LINES METEOROID DUST CLOUD RT COMETS METEOROIDS METEORS MINOR PLANETS ZODIACAL DUST METEOROIDS UF meteorids BT INTERPLANETARY DUST INTERPLANETARY GRAINS INTERPLANETARY MATTER NT MICROMETEOROIDS RT COMETS METEOROID DUST CLOUD METEORS MINOR PLANETS ZODIACAL DUST METEOROLOGY RT EARTH ATMOSPHERE METEORS NT BOLIDES FIREBALLS METEORITES RT CRATERS METEOR SHOWERS METEOR STREAMS METEOR TRAILS METEORITE CRATERS METEORITE IMPACTS METEOROID DUST CLOUD METEOROIDS RADIANT [METEORS] methods of observation U OBSERVING TECHNIQUES METONIC CYCLE RT PHASE [MOON] SAROS CYCLE METROLOGY RT INSTRUMENTATION MEASUREMENT UNITS mhd U MAGNETOHYDRODYNAMICS MICHELSON INTERFEROMETERS BT OPTICAL INTERFEROMETERS RT INTENSITY INTERFEROMETERS MICHELSON INTERFEROMETRY MICHELSON INTERFEROMETRY RT MICHELSON INTERFEROMETERS OPTICAL INTERFEROMETRY MICRODENSITOMETERS BT MEASURING INSTRUMENTS RT DENSITOMETERS MICROPHOTOMETERS PHOTOGRAPHS MICRODENSITOMETRY See MICRODENSITOMETERS. MICROLENSING RT GRAVITATIONAL LENSES MICROMETEORITES BT METEORITES RT INTERPLANETARY MATTER MICROMETEOROIDS BT METEOROIDS MICROMETERS BT MEASURING INSTRUMENTS MICROPHOTOMETERS BT MEASURING INSTRUMENTS RT MICRODENSITOMETERS PHOTOGRAPHY MICROPROCESSORS BT COMPUTERS RT CONTROL SYSTEMS MICROTURBULENCE BT TURBULENCE [EARTH ATMOSPHERE] TURBULENCE [STAR ATMOSPHERE] RT ABSORPTION LINES ATMOSPHERES MICROWAVE ANTENNAS BT ANTENNAS RT MICROWAVE RADIATION MICROWAVE BACKGROUND BT BACKGROUND RADIATION COSMIC NOISE MICROWAVE RADIATION RT GAMMA RAY BACKGROUND RADIO BACKGROUND SUNYAEV ZELDOVICH EFFECT ULTRAVIOLET BACKGROUND X RAY BACKGROUND MICROWAVE EMISSION RT COSMIC NOISE MICROWAVE IMAGING RT MICROWAVE RADIATION MICROWAVE RADIATION BT RADIATION NT MICROWAVE BACKGROUND RT MICROWAVE ANTENNAS MICROWAVE IMAGING MILLIMETER RADIATION REMOTE SENSING MICROWAVE SPECTRA BT SPECTRA RT RADIO SPECTRA MICROWAVE SPECTROSCOPY BT SPECTROSCOPY MICROWAVES Combine with other terms RT MILLIMETER WAVES MIE SCATTERING BT SCATTERING RT BRILLOUIN SCATTERING RAYLEIGH SCATTERING MILKY WAY GALAXY UF galaxy [the] the galaxy BT GALAXIES LOCAL GROUP OF GALAXIES SPIRAL GALAXIES RT GALACTIC ANTICENTER GALACTIC BULGE GALACTIC CENTER GALACTIC COORDINATE SYSTEM GALACTIC PLANE GOULDS BELT HIGH VELOCITY CLOUDS HIGH VELOCITY STARS SKY BRIGHTNESS MILLIMETER ASTRONOMY BT RADIO ASTRONOMY RT RADIO OBSERVATORIES SATELLITE BORNE INSTRUMENTS SUBMILLIMETER ASTRONOMY MILLIMETER RADIATION UF mm radiation RT MICROWAVE RADIATION MILLIMETER WAVES BT ELECTROMAGNETIC WAVES RT MICROWAVES MILLS CROSS ANTENNAS BT ANTENNAS DIRECTIONAL ANTENNAS RADIO TELESCOPES RT PENCIL BEAMS MILNE EDDINGTON APPROXIMATION RT LINE WIDTHS SPECTROSCOPIC ANALYSIS MINERAL DEPOSITS RT MINERALOGY MINERALOGY RT MINERAL DEPOSITS MINIMA BT PHOTOMETRIC ELEMENTS RT LIGHT CURVES MAXIMA VARIABLE STARS VELOCITY CURVES MINOR PLANET FAMILIES Not a complete list of terms. NT AMOR GROUP APOLLO GROUP HIRAYAMA FAMILIES TROJAN GROUP RT MINOR PLANETS MINOR PLANETS UF planetoids NT NEAR EARTH ASTEROIDS RT ASTEROID BELT INTERPLANETARY MATTER KIRKWOOD GAPS METEOR STREAMS METEORITES METEOROID DUST CLOUD METEOROIDS MINOR PLANET FAMILIES PLANETESIMALS RESONANCE GAPS SOLAR SYSTEM MIRA VARIABLE STARS UF miras omicron ceti stars zeta aurigae stars BT EMISSION LINE STARS IRREGULAR VARIABLE STARS LATE TYPE GIANT STARS LONG PERIOD VARIABLE STARS PULSATING VARIABLE STARS RT RADIAL PULSATIONS S VULPECULAE STARS SEMIREGULAR VARIABLE STARS miras U MIRA VARIABLE STARS MIRROR CELLS RT MIRRORS MIRRORS BT OPTICAL COMPONENTS NT DICHROIC MIRRORS PRIMARY MIRRORS TELESCOPE MIRRORS RT ABERRATIONS ALUMINIZING ALUMINUM COATINGS CATADIOPTRIC SYSTEMS CATOPTRIC SYSTEMS COATINGS COLLIMATORS FIGURING GLASS MIRROR CELLS OPTICAL INSTRUMENTS OPTICAL MATERIALS POLISHING REFLECTION SURFACES [OPTICAL] THIN FILMS MISSING MASS RT CLUSTERS OF GALAXIES COSMOLOGY MASS TO LIGHT RATIOS VELOCITY DISPERSION MK CLASSIFICATION BT SPECTRAL CLASSIFICATION NT LUMINOSITY CLASS RT LUMINOSITY SPECTRA mm radiation U MILLIMETER RADIATION mmt U MULTIPLE MIRROR TELESCOPES MODELS Combine with other terms NT COMPUTER MODELS ORRERIES RT EQUILIBRIUM FIGURES NUMERICAL SIMULATION POLYTROPES SIMULATION STELLAR STRUCTURE MODULATION Combine with other terms MODULATION TRANSFER FUNCTION UF mtf BT TRANSFER FUNCTIONS RT OPTICAL INSTRUMENTS OPTICAL TESTING OPTICAL TRANSFER FUNCTION modulus U DISTANCE MODULUS MOLDAVITES BT METEORITES TEKTITES RT AUSTRALITES BEDIASITES CHONDRITES MOLECULAR ASTROPHYSICS RT COSMOCHEMISTRY MOLECULAR BANDS MOLECULAR LINES MOLECULAR SPECTROSCOPY MOLECULAR BANDS BT SPECTRAL BANDS NT b BAND G BAND PHILLIPS BANDS SWAN BANDS RT LATE TYPE STARS MOLECULAR ASTROPHYSICS MOLECULAR LINES MOLECULAR SPECTRA ZIRCONIUM STARS MOLECULAR CLOUDS BT INTERSTELLAR MATTER NT GIANT MOLECULAR CLOUDS RT INTERSTELLAR MOLECULES MOLECULAR HYDROGEN MOLECULAR HYDROGEN BT INTERSTELLAR MOLECULES MOLECULES NT ORTHOHYDROGEN PARAHYDROGEN RT MOLECULAR CLOUDS MOLECULAR LINES BT SPECTRAL LINES RT FINE STRUCTURE LATE TYPE STARS MOLECULAR ASTROPHYSICS MOLECULAR BANDS SPECTRAL BANDS MOLECULAR SPECTRA BT SPECTRA NT P BRANCH PHILLIPS BANDS RT b BAND G BAND LATE TYPE STARS MOLECULAR BANDS MOLECULES ORGANIC MOLECULES Q BRANCH RAMAN SPECTROSCOPY SPECTRAL BANDS SWAN BANDS VIBRATIONAL SPECTRA MOLECULAR SPECTROSCOPY See MOLECULAR SPECTRA. RT MOLECULAR ASTROPHYSICS MOLECULES NT INTERSTELLAR MOLECULES MOLECULAR HYDROGEN ORGANIC MOLECULES RT MOLECULAR SPECTRA MOMENTUM RT ANGULAR MOMENTUM MASS VELOCITY MONOCHROMATORS BT MEASURING INSTRUMENTS OPTICAL INSTRUMENTS MONTE CARLO TECHNIQUES BT DATA PROCESSING RT STATISTICS MOON Earth's satellite. See under SATELLITES or PLANETS for more RTs. See also LUNAR. BT SATELLITES RT ANOMALISTIC MONTH APOGEE CRATERS CRUST CRUSTAL DYNAMICS EARTHSHINE EQUATION OF THE CENTER LIBRATION LUNAR DOMES LUNAR ECLIPSE LUNAR LASER RANGING LUNAR THEORY MANTLES MARIA MASCONS MOONQUAKES NUTATION OCCULTATIONS PERIGEE PHASE ANGLE PHASE DEFECT RAYS REGRESSION OF NODES SELENOLOGY SOLAR ECLIPSE SURFACES [CELESTIAL BODIES] MOONQUAKES RT EARTHQUAKES MOON MORPHOLOGY Combine with other terms RT CLASSIFICATION MOTION Combine with other terms NT APPARENT SUPERLUMINAL MOTION APSIDAL MOTIONS INTERNAL MOTIONS ORBITAL MOTIONS POLAR MOTION PROPER MOTIONS SOLAR MOTION SPACE MOTION STELLAR MOTIONS WAVE MOTION RT ORBITS ORRERIES PLANETARIA MOTTLES RT CHROMOSPHERE SUN MOVING CLUSTER PARALLAX UF cluster parallax BT PARALLAXES RT DYNAMICAL PARALLAX KINEMATIC PARALLAX OPEN STAR CLUSTERS PROPER MOTIONS RADIANT [MOVING CLUSTER] SECULAR PARALLAX mtf U MODULATION TRANSFER FUNCTION MULTICHANNEL DETECTORS BT DETECTORS NT CCD DETECTORS DIODE ARRAYS IMAGE TUBES RETICON ARRAYS TELEVISION DETECTORS RT CHARGE COUPLED DEVICES MULTICHANNEL SPECTROMETERS MULTICHANNEL SPECTROMETERS BT SPECTROMETERS RT MULTICHANNEL DETECTORS multicolor photometry U PHOTOMETRY MULTIPERIODIC PULSATION NT DOUBLE MODE PULSATION RT FOURIER ANALYSIS FREQUENCY ANALYSIS MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS PULSATION MODES MULTIPERIODIC VARIABLE STARS BT PULSATING VARIABLE STARS NT BETA CEPHEI STARS DELTA SCUTI STARS DOUBLE MODE VARIABLE STARS DWARF CEPHEIDS RS CANUM VENATICORUM STARS SX PHOENICIS STARS ZZ CETI STARS RT MULTIPERIODIC PULSATION OVERTONE FREQUENCIES OVERTONE MODES PULSATION MODES MULTIPLE GALAXIES BT GALAXIES RT CLUSTERS OF GALAXIES GROUPS OF GALAXIES MULTIPLE MIRROR TELESCOPES UF mmt BT NEW TECHNOLOGY TELESCOPES OPTICAL TELESCOPES REFLECTING TELESCOPES RT ACTIVE OPTICS SEGMENTED OPTICS VERY LARGE TELESCOPES MULTIPLE STARS UF triple stars RT BINARY STARS COMPANION STARS ORBIT DETERMINATION ORBITS MUONS BT LEPTONS N BODY PROBLEM UF many body problem RT CELESTIAL MECHANICS ORBITS PERTURBATION STELLAR DYNAMICS THREE BODY PROBLEM TWO BODY PROBLEM N GALAXIES BT GALAXIES RT COMPACT GALAXIES GALACTIC NUCLEI GIANT RADIO GALAXIES N MAGNITUDE BT APPARENT MAGNITUDES RT FAR INFRARED RADIATION INFRARED PHOTOMETRY N STARS BT LATE TYPE STARS RT SPECTRAL TYPES TECHNETIUM STARS NADIR BT POLES RT HORIZON COORDINATE SYSTEM ZENITH NAKED SINGULARITY BT SINGULARITY RT BLACK HOLES QUANTUM COSMOLOGY SPACETIME SINGULARITY WHITE HOLES NARROW BAND PHOTOMETRY BT CCD PHOTOMETRY PHOTOELECTRIC PHOTOMETRY NT H ALPHA PHOTOMETRY H BETA PHOTOMETRY RT BROAD BAND PHOTOMETRY MEDIUM BAND PHOTOMETRY NASMYTH FOCUS BT FOCUS RT CASSEGRAIN FOCUS COUDE FOCUS NEWTONIAN FOCUS PRIME FOCUS NATURAL LINE BROADENING BT LINE BROADENING RT NATURAL LINE WIDTH SPECTRAL LINES NATURAL LINE WIDTH BT LINE WIDTHS RT DOPPLER BROADENING LINE BROADENING NATURAL LINE BROADENING PRESSURE BROADENING SPECTRAL LINES STARK BROADENING ZEEMAN SPLITTING nautical almanac U EPHEMERIDES NEAR EARTH ASTEROIDS BT MINOR PLANETS NEAR INFRARED RADIATION BT INFRARED RADIATION RT FAR INFRARED RADIATION H MAGNITUDE I MAGNITUDE INFRARED PHOTOMETRY J MAGNITUDE K MAGNITUDE L MAGNITUDE NEAR ULTRAVIOLET RADIATION BT ULTRAVIOLET RADIATION RT EXTREME ULTRAVIOLET RADIATION FAR ULTRAVIOLET RADIATION NEARBY DWARF STARS BT DWARF STARS NEARBY STARS NEARBY GALAXIES BT GALAXIES NT LOCAL GROUP OF GALAXIES MAGELLANIC CLOUDS RT BRIGHT GALAXIES NEARBY STARS NT NEARBY DWARF STARS RT TRIGONOMETRIC PARALLAX NEBULAE Named nebulae not included. NOT including galaxies BT INTERSTELLAR MATTER NT BIPOLAR NEBULAE BRIGHT NEBULAE COMPACT NEBULAE DARK NEBULAE DENSE CLOUDS DENSE MATTER DIFFUSE NEBULAE DUST NEBULAE EMISSION NEBULAE FILAMENTARY NEBULAE GASEOUS NEBULAE PLANETARY NEBULAE REFLECTION NEBULAE RING NEBULAE RT FILAMENTS [NEBULAE] FORBIDDEN LINES FORBIDDEN TRANSITIONS H II REGIONS OPIK THEORY SURFACE PHOTOMETRY NEGATIVE H ION UF h minus ion RT OPACITY STELLAR ATMOSPHERES NEIGHBORHOOD Combine with other terms NEUMANN LINES RT EMISSION LINES EMISSION SPECTRA METEORITES NEUTRAL GASES BT GASES NT NEUTRAL HYDROGEN RT H I REGIONS NEUTRAL HYDROGEN UF H I BT NEUTRAL GASES RT 21 CM LINE NEUTRINOS BT ELEMENTARY PARTICLES LEPTONS PARTICLES RT ANTINEUTRINOS SOLAR NEUTRINO PROBLEM SUPERNOVAS NEUTRON STARS BT COLLAPSED STARS COMPACT OBJECTS DEGENERATE STARS RELATIVISTIC STARS NT HZ HERCULIS STARS RT ALFVEN SURFACE PULSARS QUARKS RELATIVISTIC ASTROPHYSICS SUPERNOVA REMNANTS X RAY BINARY STARS X RAY BURSTS X RAY PULSARS NEUTRONS BT ELEMENTARY PARTICLES FUNDAMENTAL PARTICLES RT ALPHA PARTICLES NUCLEI [ATOMS] NEW TECHNOLOGY TELESCOPES BT OPTICAL TELESCOPES NT MULTIPLE MIRROR TELESCOPES VERY LARGE TELESCOPES RT COMPUTERS CONTROL SYSTEMS NEWTONIAN FOCUS UF newtonian telescopes BT FOCUS RT CASSEGRAIN FOCUS COUDE FOCUS NASMYTH FOCUS NEWTONIAN GRAVITATION RT GENERAL THEORY OF RELATIVITY GRAVITATIONAL CONSTANT GRAVITATIONAL FORCE newtonian telescopes U NEWTONIAN FOCUS night sky background U NIGHT SKY BRIGHTNESS NIGHT SKY BRIGHTNESS UF night sky background BT SKY BRIGHTNESS RT AIRGLOW AURORAS GEGENSCHEIN RAYLEIGH RAYLEIGH SCATTERING ZODIACAL LIGHT NIGHT VISION RT DARK ADAPTION nightglow U AIRGLOW NOCTILUCENT CLOUDS In earth's atmosphere. BT CLOUDS RT EARTH ATMOSPHERE LUMINESCENCE NODES UF ascending nodes descending nodes line of nodes RT INCLINATION ORBITS VIBRATION NOISE Combine with other terms UF interference [noise] NT BACKGROUND NOISE COSMIC NOISE SHOT NOISE SKY NOISE RT INTEGRATION TIME SIGNAL TO NOISE RATIO NOMENCLATURE RT CATALOGS CLASSIFICATION NONEQUILIBRIUM FLOW BT FLOW RT FLOW INSTABILITY NONLTE TRANSFER RT ENERGY TRANSFER LOCAL THERMODYNAMIC EQUILIBRIUM RADIATION MECHANISMS NONMAINSEQUENCE STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT EVOLVED STARS POSTMAINSEQUENCE STARS PREMAINSEQUENCE STARS NONRADIAL PULSATIONS RT BETA CEPHEI STARS DELTA SCUTI STARS PULSATING VARIABLE STARS PULSATION MODES ZZ CETI STARS NONTHERMAL PARTICLES RT NONTHERMAL SOURCES NONTHERMAL RADIATION RT NONTHERMAL SOURCES NONTHERMAL SOURCES RT NONTHERMAL PARTICLES NONTHERMAL RADIATION SYNCHROTRON RADIATION NORTH CELESTIAL POLE BT CELESTIAL POLES RT SOUTH CELESTIAL POLE NORTH GALACTIC POLE BT GALACTIC POLES RT SOUTH GALACTIC POLE NORTHERN HEMISPHERE RT SOUTHERN HEMISPHERE nova like variable stars U UX URSAE MAJORIS STARS NOVAS UF prenovas symbiotic novas BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS HIGH LUMINOSITY STARS NT FAST NOVAS RECURRENT NOVAS SLOW NOVAS X RAY NOVAS RT MASS LOSS OPTICAL OUTBURSTS PROGENITORS SUPERNOVAS NOVOIDS BT SLOW NOVAS NUCLEAR ASTROPHYSICS RT HIGH ENERGY ASTROPHYSICS NUCLEAR PHYSICS NUCLEAR FISSION UF fission BT NUCLEAR REACTIONS RT RADIOACTIVITY NUCLEAR FUSION UF fusion BT NUCLEAR REACTIONS NT CARBON BURNING HELIUM BURNING OXYGEN BURNING SILICON BURNING RT CARBON FLASH CARBON NITROGEN CYCLE e PROCESS HELIUM FLASH HELIUM SHELL FLASH HYDROGEN BURNING PROTON PROTON REACTION SHELL BURNING STELLAR INTERIORS SUPERNOVAS NUCLEAR PHYSICS RT INTERACTIONS NUCLEAR ASTROPHYSICS NUCLEAR RADIATION NUCLEAR REACTIONS STRONG INTERACTIONS WEAK INTERACTIONS NUCLEAR RADIATION NT ALPHA PARTICLES ELECTRONS GAMMA RAYS POSITRONS RT CERENKOV RADIATION NUCLEAR PHYSICS NUCLEAR REACTIONS NT NUCLEAR FISSION NUCLEAR FUSION URCA PROCESSES RT CARBON BURNING NUCLEAR PHYSICS NUCLEOSYNTHESIS SOLAR NEUTRINO PROBLEM NUCLEI [ATOMS] NT BOSE EINSTEIN NUCLEI FERMI DIRAC NUCLEI RT NEUTRONS PROTONS NUCLEI [CELESTIAL OBJECTS] Combine with other terms NT COMPACT NUCLEI GALACTIC NUCLEI RT cD GALAXIES COMETS DIRTY SNOWBALL THEORY NUCLEOSYNTHESIS NT CARBON BURNING HELIUM BURNING HYDROGEN BURNING OXYGEN BURNING SILICON BURNING RT NUCLEAR REACTIONS p PROCESS r PROCESS s PROCESS STELLAR INTERIORS SUPERNOVAS NUMERICAL ANALYSIS BT DATA PROCESSING RT NUMERICAL INTEGRATION NUMERICAL METHODS NUMERICAL SIMULATION NUMERICAL INTEGRATION RT NUMERICAL ANALYSIS NUMERICAL METHODS NUMERICAL METHODS RT NUMERICAL ANALYSIS NUMERICAL INTEGRATION NUMERICAL SIMULATION NUMERICAL SIMULATION RT COMPUTER MODELS MODELS NUMERICAL ANALYSIS NUMERICAL METHODS NUTATION RT EARTH ROTATION EQUATION OF THE EQUINOXES MOON POLAR MOTION PRECESSION O ASSOCIATIONS BT STAR ASSOCIATIONS RT O CLUSTERS OB ASSOCIATIONS O CLUSTERS BT OPEN STAR CLUSTERS RT B STARS O ASSOCIATIONS O STARS O DWARF STARS BT DWARF STARS O STARS O GIANT STARS BT O STARS O MAGNITUDE BT APPARENT MAGNITUDES RT FAR INFRARED RADIATION INFRARED PHOTOMETRY O STARS BT EARLY TYPE STARS OB STARS YOUNG STARS NT O DWARF STARS O GIANT STARS O SUBDWARF STARS O SUPERGIANT STARS Oe STARS Oef STARS Of STARS RT EARLY TYPE VARIABLE STARS O CLUSTERS SPECTRAL TYPES WOLF RAYET STARS O SUBDWARF STARS BT O STARS SUBDWARF STARS O SUPERGIANT STARS BT EARLY TYPE SUPERGIANT STARS O STARS OB SUPERGIANT STARS SUPERGIANT STARS OB ASSOCIATIONS BT STAR ASSOCIATIONS RT O ASSOCIATIONS YOUNG STARS OB STARS BT EARLY TYPE STARS YOUNG STARS NT B STARS O STARS OB SUPERGIANT STARS RT RUNAWAY STARS YOUNG STAR CLUSTERS OB SUPERGIANT STARS BT EARLY TYPE SUPERGIANT STARS OB STARS NT B SUPERGIANT STARS O SUPERGIANT STARS OBJECTIVE GRATINGS BT DIFFRACTION GRATINGS TRANSMISSION GRATINGS RT ECHELLE GRATINGS REFLECTION GRATINGS OBJECTIVE PRISMS BT PRISMS RT SCHMIDT TELESCOPES OBJECTIVES Primary optics of telescopes. NT PRIMARY LENSES PRIMARY MIRRORS RT OPTICAL TELESCOPES OBLATENESS RT ELLIPTICAL GALAXIES EQUATORIAL BULGE PLANETS ROTATION OBLIQUE ROTATORS RT Ap STARS MAGNETIC STARS SPECTRUM VARIABLE STARS obliquity U OBLIQUITY OF ECLIPTIC OBLIQUITY OF ECLIPTIC UF obliquity RT CELESTIAL EQUATOR ECLIPTIC ECLIPTIC PLANE PHASE DEFECT PRECESSION OBSERVATIONAL COSMOLOGY RT COLOR REDSHIFT RELATION COSMOLOGICAL DISTANCE SCALE GALAXY COUNTS GALAXY DISTRIBUTION HUBBLE LAW OBSERVATIONS RADIO SOURCE COUNTS REDSHIFT REDSHIFT DISTANCE RELATION OBSERVATIONS Combine with other terms NT OPTICAL OBSERVATIONS RT DATA ACQUISITION OBSERVATIONAL COSMOLOGY OBSERVING TECHNIQUES RESEARCH OBSERVATORIES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT ANTARCTIC OBSERVATORIES GAMMA RAY OBSERVATORIES GEOPHYSICAL OBSERVATORIES INFRARED OBSERVATORIES OPTICAL OBSERVATORIES RADIO OBSERVATORIES SPACE OBSERVATORIES RT DOMES PLANETARIA SITE PROTECTION SITE TESTING TELESCOPES X RAY OBSERVATORIES OBSERVING TECHNIQUES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF methods of observation NT ASTROMETRY INTERFEROMETRY PHOTOMETRY POLARIMETRY RADIO ASTROMETRY RADIO INTERFEROMETRY SPECTROMETRY SPECTROPHOTOMETRY SPECTROSCOPY RT ASTRONOMICAL TECHNIQUES DATA ACQUISITION DATA PROCESSING OBSERVATIONS OCCULTATIONS PHOTOGRAPHY OCCULTATIONS NT RADIO OCCULTATIONS RT ANGULAR DIAMETERS BINARY STARS DIAMETERS ECLIPSES MOON OBSERVING TECHNIQUES PLANETS TRANSITS OCCULTING DISK RT SEPARATION VISUAL BINARY STARS OCEAN TIDES BT TIDES RT OCEANOGRAPHY OCEANOGRAPHY RT OCEAN TIDES Oe STARS BT EARLY TYPE EMISSION STARS O STARS Oef STARS BT EARLY TYPE EMISSION STARS O STARS RT EARLY TYPE STARS Of STARS Of STARS BT EARLY TYPE EMISSION STARS O STARS RT Oef STARS OH ABSORPTION BT INTERSTELLAR ABSORPTION RT HYDROXYL RADICAL OH CLOUDS BT INTERSTELLAR MATTER RT HYDROXYL RADICAL OH EMISSION RT HYDROXYL RADICAL OH IR STARS BT GIANT STARS INFRARED SOURCES OH SOURCES RT HYDROXYL RADICAL OH MASERS VARIABLE STARS OH LINES RT HYDROXYL RADICAL OH MASERS Subtypes not included. BT MASERS RT HYDROXYL RADICAL OH IR STARS SiO MASERS WATER MASERS OH radical Synonym: hydroxyl radical. U HYDROXYL RADICAL OH SOURCES BT RADIO SOURCES NT OH IR STARS RT HYDROXYL RADICAL OLD STARS BT EVOLVED STARS NT POPULATION II STARS PREGALACTIC STARS omicron ceti stars U MIRA VARIABLE STARS ON LINE SYSTEMS RT DATA CENTERS DATA PROCESSING OORT CLOUD UF oort comet cloud RT COMETS oort comet cloud U OORT CLOUD OORT CONSTANTS RT GALACTIC ROTATION GALACTIC STRUCTURE OORT FORMULAS RT GALACTIC ROTATION GALACTIC STRUCTURE OOSTERHOFF GROUPS RT GLOBULAR STAR CLUSTERS METAL ABUNDANCE RR LYRAE STARS OPACITY BT OPTICAL PROPERTIES NT KRAMERS OPACITY ROSSELAND OPACITY RT ABSORPTION ATMOSPHERES NEGATIVE H ION OPTICAL DEPTH RADIATION RADIATIVE TRANSFER TRANSPARENCY OPEN STAR CLUSTERS UF galactic clusters BT STAR CLUSTERS NT O CLUSTERS YOUNG STAR CLUSTERS RT BLUE STRAGGLER STARS MOVING CLUSTER PARALLAX POPULATION I STARS RADIANT [MOVING CLUSTER] SPIRAL ARMS STAR ASSOCIATIONS TURNOFF POINT OPEN UNIVERSE BT COSMOLOGY RT BIG BANG THEORY CLOSED UNIVERSE STEADY STATE THEORY OPIK THEORY RT NEBULAE SUPERNOVAS OPPOSITION Refers to planet positions. RT CONJUNCTION QUADRATURE SYNODIC PERIOD SYZYGY OPTICAL BURSTS Specifically from BURSTERS. BT BURSTS RT BURSTERS GAMMA RAY BURSTS RADIO BURSTS X RAY BURSTS OPTICAL COMPONENTS Not a complete list of terms. NT CORRECTOR PLATES DIFFRACTION GRATINGS FIELD CORRECTORS GRISMS INTERFERENCE FILTERS LENSES MIRRORS OPTICAL FIBERS OPTICAL FILTERS OPTICAL WAVEGUIDES OPTICAL WINDOWS [OPTICS] optical counterparts U OPTICAL IDENTIFICATIONS OPTICAL DEPTH UF optical thickness RT ABSORPTION COEFFICIENT GAS DENSITY OPACITY OPTICAL DESIGN RT OPTICAL INSTRUMENTS OPTICAL DOUBLE STARS Use only for pair in chance alignment. Refer also to VISUAL BINARY STARS. UF visual double stars [1] RT ANGULAR SEPARATION optical equipment U OPTICAL INSTRUMENTS OPTICAL FIBERS UF glass fibers BT OPTICAL COMPONENTS OPTICAL WAVEGUIDES RT FIBER OPTICS GLASS OPTICAL INSTRUMENTS OPTICAL FILMS UF films [optical] NT ANTIREFLECTION COATINGS THIN FILMS RT DICHROIC MIRRORS INTERFERENCE FILTERS LIGHT INTERFERENCE OPTICAL FILTERS UF color filters BT FILTERS OPTICAL COMPONENTS NT INTERFERENCE FILTERS PHOTOGRAPHIC FILTERS RT DICHROIC MIRRORS LIGHT INTERFERENCE OPTICAL WINDOWS [OPTICS] PHOTOMETRY ULTRAVIOLET FILTERS OPTICAL FLARES BT FLARES RT FLARE STARS PROMINENCES OPTICAL GLASS BT GLASS OPTICAL MATERIALS RT OPTICAL WINDOWS [OPTICS] OPTICAL IDENTIFICATIONS UF optical counterparts RT GAMMA RAY SOURCES RADIO SOURCES X RAY IDENTIFICATIONS X RAY SOURCES OPTICAL INSTRUMENTS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF optical equipment NT CAMERAS CORONAGRAPHS MONOCHROMATORS OPTICAL SCANNERS PHOTOMETERS POLARIMETERS SEEING MONITORS SPECTROGRAPHS TELESCOPES RT COLLIMATORS FIELD CORRECTORS HARTMANN TEST LENSES MIRRORS MODULATION TRANSFER FUNCTION OPTICAL DESIGN OPTICAL FIBERS OPTICAL MATERIALS OPTICAL SYSTEMS OPTICAL TESTING OPTICAL TRANSFER FUNCTION PRISMS OPTICAL INTERFEROMETERS UF stellar interferometers BT INTERFEROMETERS NT INTENSITY INTERFEROMETERS MICHELSON INTERFEROMETERS RT LONG BASELINE INTERFEROMETERS OPTICAL INTERFEROMETRY UF light interferometry stellar interferometry BT INTERFEROMETRY RT INTERFERENCE FRINGES INTERFERENCE [WAVES] LIGHT INTERFERENCE LONG BASELINE INTERFEROMETRY MICHELSON INTERFEROMETRY OPTICAL MATERIALS NT GLASS OPTICAL GLASS RT LENSES MIRRORS OPTICAL INSTRUMENTS OPTICAL OBSERVATIONS BT OBSERVATIONS RT OPTICAL OBSERVATORIES OPTICAL OBSERVATORIES BT OBSERVATORIES RT OPTICAL OBSERVATIONS OPTICAL TELESCOPES SEEING MONITORS OPTICAL OUTBURSTS NOT from BURSTERS. BT OUTBURSTS RT CATACLYSMIC VARIABLE STARS FLARE STARS NOVAS SUPERNOVAS OPTICAL PATHLENGTH RT REFRACTIVE INDEX OPTICAL POSITIONS RT ASTROMETRY OPTICAL PROPERTIES Not a complete list of terms. BT PROPERTIES NT ALBEDO BRIGHTNESS COLOR OPACITY REFRACTIVE INDEX RT BRIGHTNESS TEMPERATURE DARKNESS ISOTROPY OPTICS POLARIZATION [WAVES] OPTICAL PULSARS BT PULSARS RT RADIO PULSARS OPTICAL RADAR BT RADAR RT LASER RANGING LASERS LUNAR LASER RANGING SATELLITE LASER RANGING OPTICAL SCANNERS BT OPTICAL INSTRUMENTS RT SPECTROPHOTOMETRY optical spectrometers U SPECTROGRAPHS SPECTROMETERS OPTICAL SPECTROSCOPY BT SPECTROSCOPY OPTICAL SYSTEMS RT ABERRATIONS APERTURES CHROMATIC ABERRATION COMA DISTORTION FIELD CURVATURE OPTICAL INSTRUMENTS OPTICAL TELESCOPES BT TELESCOPES NT AUTOMATIC PATROL TELESCOPES MULTIPLE MIRROR TELESCOPES NEW TECHNOLOGY TELESCOPES REFLECTING TELESCOPES REFRACTING TELESCOPES VERY LARGE TELESCOPES RT CATADIOPTRIC SYSTEMS CATOPTRIC SYSTEMS DIOPTRIC SYSTEMS EYEPIECES OBJECTIVES OPTICAL OBSERVATORIES SECONDARY MIRRORS OPTICAL TESTING RT FIGURING MODULATION TRANSFER FUNCTION OPTICAL INSTRUMENTS OPTICAL TRANSFER FUNCTION optical thickness U OPTICAL DEPTH OPTICAL TRANSFER FUNCTION UF otf BT TRANSFER FUNCTIONS RT MODULATION TRANSFER FUNCTION OPTICAL INSTRUMENTS OPTICAL TESTING OPTICAL WAVEGUIDES BT OPTICAL COMPONENTS WAVEGUIDES NT OPTICAL FIBERS OPTICAL WINDOWS Low absorption in atmosphere. BT ATMOSPHERIC WINDOWS RT INFRARED WINDOWS RADIO WINDOWS OPTICAL WINDOWS [OPTICS] BT OPTICAL COMPONENTS RT OPTICAL FILTERS OPTICAL GLASS OPTICS Combine with other terms NT ACTIVE OPTICS ADAPTIVE OPTICS ASTRONOMICAL OPTICS FIBER OPTICS RT ABERRATIONS ADJUSTMENT ANGULAR RESOLUTION COLLIMATION OPTICAL PROPERTIES REFRACTIVE INDEX RESOLUTION TRANSMISSION ORBIT DETERMINATION RT BINARY STARS MULTIPLE STARS PLANETS ORBITAL ELEMENTS See also ORBITS UF elements of orbits NT ANOMALY APSIDES CENTER OF MASS ECCENTRICITY INCLINATION OSCULATORY ELEMENTS PERIOD POSITION ANGLE SEMIMAJOR AXIS RT ACCELERATION CELESTIAL MECHANICS ORBITS REGRESSION OF NODES ORBITAL EVOLUTION RT CELESTIAL MECHANICS ORBITAL MOTIONS BT MOTION RT CELESTIAL MECHANICS CIRCULAR ORBITS ORBITAL VELOCITY VISUAL BINARY STARS ORBITAL THEORY RT CELESTIAL MECHANICS ORBITAL VELOCITY BT VELOCITY RT ANGULAR VELOCITY ESCAPE VELOCITY ORBITAL MOTIONS ORBITS TANGENTIAL VELOCITY ORBITING OBSERVATORIES BT SPACE ASTRONOMY SPACE GEODESY SPACE OBSERVATORIES RT ARTIFICIAL SATELLITES SPACE ASTROMETRY ORBITS See also ORBITAL ELEMENTS. NT ELLIPTICAL ORBITS GEOCENTRIC ORBITS HELIOCENTRIC ORBITS HYPERBOLIC ORBITS KEPLERIAN ORBITS OSCULATING ORBITS PARABOLIC ORBITS PERIODIC ORBITS POLAR ORBITS RT ACCELERATION APSIDAL MOTIONS APSIDES BINARY STARS CELESTIAL MECHANICS HIGH VELOCITY STARS LOCAL STANDARD OF REST MOTION MULTIPLE STARS N BODY PROBLEM NODES ORBITAL ELEMENTS ORBITAL VELOCITY PARABOLIC VELOCITY PERIOD PERTURBATION PERTURBATION THEORY PLANETS POSITION ANGLE ROCHE LIMIT SCHWARZSCHILD METRIC SYNCHRONOUS ROTATION THREE BODY PROBLEM TRAJECTORIES ORGANIC MATTER NT ORGANIC MOLECULES ORGANIC MOLECULES BT MOLECULES ORGANIC MATTER RT INTERSTELLAR MOLECULES MOLECULAR SPECTRA ORIENTATION RT ADJUSTMENT ALIGNMENT [OPTICS] COLLIMATION POSITION ANGLE ORIGIN Combine with other terms RT CHEMICAL ELEMENTS ELEMENT FORMATION GALAXIES LIFE PLANETS SOLAR SYSTEM ORION POPULATION STARS RT EARLY TYPE STARS PREMAINSEQUENCE STARS ORRERIES BT MODELS RT MOTION PLANETARIA ORTHOHYDROGEN BT MOLECULAR HYDROGEN RT PARAHYDROGEN ORTHOSCOPIC EYEPIECE BT EYEPIECES OSCILLATING UNIVERSE BT COSMOLOGY RT FRIEDMANN UNIVERSE OSCILLATIONS Combine with other terms RT AMPLITUDES DECAY [OSCILLATIONS] e FOLDING TIME PENDULUMS WAVES OSCILLATOR STRENGTHS UF f values RT LINE FORMATION LINE WIDTHS TRANSITION PROBABILITIES OSCULATING ORBITS BT ORBITS OSCULATORY ELEMENTS BT ORBITAL ELEMENTS RT CELESTIAL MECHANICS PERTURBATION otf U OPTICAL TRANSFER FUNCTION OUTBURSTS BT BURSTS FLARES NT OPTICAL OUTBURSTS OUTER PLANETS UF jovian planets BT PLANETS RT INNER PLANETS OUTGASSING RT CRYOGENICS VACUUM TECHNIQUES OVERTONE FREQUENCIES See SN for OVERTONE MODES. Also see HARMONIC FREQUENCIES. UF harmonic overtones overtones RT FOURIER ANALYSIS FUNDAMENTAL FREQUENCY HARMONIC FREQUENCIES MULTIPERIODIC VARIABLE STARS OVERTONE MODES OVERTONE MODES Of pulsation frequencies, not Fourier components of non- sinusoidal variations. UF overtones BT PULSATION MODES RT FUNDAMENTAL MODE MULTIPERIODIC VARIABLE STARS OVERTONE FREQUENCIES PULSATING VARIABLE STARS overtones U OVERTONE FREQUENCIES OVERTONE MODES OXYGEN Combine with other terms OXYGEN BURNING BT NUCLEAR FUSION NUCLEOSYNTHESIS RT CARBON BURNING HELIUM BURNING HYDROGEN BURNING STELLAR INTERIORS OZONE LAYER RT EARTH ATMOSPHERE P BRANCH BT MOLECULAR SPECTRA P CYGNI LINE PROFILES BT LINE PROFILES RT EMISSION LINE STARS MASS LOSS S DORADUS STARS SHELL STARS SYMBIOTIC STARS p cygni stars U S DORADUS STARS P MAGNITUDE BT APPARENT MAGNITUDES RT FAR INFRARED RADIATION INFRARED PHOTOMETRY p PROCESS RT NUCLEOSYNTHESIS r PROCESS s PROCESS SUPERNOVAS PAIR ANNIHILATION RT ELECTRONS GAMMA RAYS POSITRONS PAIR PRODUCTION BT PARTICLE PRODUCTION RT ELECTRONS GAMMA RAYS POSITRONS PALEOMAGNETISM RT CONTINENTAL DRIFT GEOMAGNETISM MAGNETIC FIELDS PARABOLIC ANTENNAS BT ANTENNAS DIRECTIONAL ANTENNAS RT CASSEGRAIN FOCUS PARABOLIC MIRRORS See PARABOLIC REFLECTORS. RT PARABOLIC REFLECTORS PARABOLIC ORBITS BT ORBITS RT CIRCULAR ORBITS COMETS ELLIPTICAL ORBITS HYPERBOLIC ORBITS PARABOLIC REFLECTORS RT DISH ANTENNAS PARABOLIC MIRRORS RADAR TELESCOPES RADIO TELESCOPES REFLECTING TELESCOPES PARABOLIC VELOCITY BT VELOCITY RT ESCAPE VELOCITY ORBITS PARAHYDROGEN BT MOLECULAR HYDROGEN RT ORTHOHYDROGEN parallax second U PARSEC PARALLAXES NT ANNUAL PARALLAX DIURNAL PARALLAX DYNAMICAL PARALLAX KINEMATIC PARALLAX MOVING CLUSTER PARALLAX PHOTOMETRIC PARALLAX SECULAR PARALLAX STATISTICAL PARALLAX TRIGONOMETRIC PARALLAX RT ASTROMETRY ASTRONOMICAL UNIT DISTANCE DISTANCE MODULUS PARAMETRIC AMPLIFIERS BT AMPLIFIERS PARSEC UF parallax second RT ASTRONOMICAL UNIT DISTANCE DISTANCE SCALE LIGHT YEAR PARTIAL ECLIPSE BT ECLIPSES RT ECLIPSING BINARY STARS TOTAL ECLIPSES PARTICLE ACCELERATION RT ELEMENTARY PARTICLES PARTICLE ACCRETION RT ACCRETION PARTICLE BEAMS RT HIGH ENERGY ASTROPHYSICS PARTICLE CREATION RT ELEMENTARY PARTICLES PARTICLE ESCAPE RT ELEMENTARY PARTICLES PARTICLE INTERACTIONS RT ELEMENTARY PARTICLES PARTICLE PRODUCTION NT PAIR PRODUCTION RT ELEMENTARY PARTICLES PARTICLE PROPAGATION PARTICLES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT ALPHA PARTICLES BOSONS ELECTRONS ELEMENTARY PARTICLES FUNDAMENTAL PARTICLES IONS LEPTONS NEUTRINOS PARTONS PLASMAS POSITRONS PROTONS RELATIVISTIC PARTICLES PARTONS BT ELEMENTARY PARTICLES PARTICLES PASCHEN BACK EFFECT RT MAGNETIC FIELDS ZEEMAN SPLITTING paschen lines U PASCHEN SERIES PASCHEN SERIES UF paschen lines RT BALMER SERIES BRACKETT SERIES HYDROGEN SPECTRUM LYMAN SERIES PFUND SERIES PAST LIGHT CONE BT LIGHT CONE RT FUTURE LIGHT CONE PAUL TRAP RT ELECTRIC FIELDS IONS RADIO FREQUENCIES peculiar a stars U Ap STARS PECULIAR GALAXIES BT GALAXIES PECULIAR OBJECTS NT COMPACT GALAXIES DWARF GALAXIES EMISSION LINE GALAXIES Ep GALAXIES INTERACTING GALAXIES RING GALAXIES SEYFERT GALAXIES RT MARKARIAN GALAXIES PECULIAR GIANT STARS BT GIANT STARS PECULIAR STARS PECULIAR MOTIONS RT LOCAL STANDARD OF REST PECULIAR VELOCITY PROPER MOTIONS RADIAL VELOCITY STELLAR MOTIONS PECULIAR OBJECTS Combine with other terms NT PECULIAR GALAXIES PECULIAR STARS PECULIAR STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. BT PECULIAR OBJECTS NT Ap STARS Bp STARS HEAVY METAL STARS HOLMIUM STARS MAGNETIC STARS PECULIAR GIANT STARS PECULIAR VARIABLE STARS RT ABNORMAL SPECTRA ABUNDANCE CHEMICAL COMPOSITION EMISSION LINE STARS PECULIAR VARIABLE STARS BT PECULIAR STARS VARIABLE STARS PECULIAR VELOCITY BT VELOCITY RT LOCAL STANDARD OF REST PECULIAR MOTIONS RADIAL VELOCITY STELLAR MOTIONS PENCIL BEAMS RT MILLS CROSS ANTENNAS RADIO INTERFEROMETERS PENDULUMS BT TIMING EQUIPMENT RT GEODESY GRAVITY OSCILLATIONS PENROSE PROCESS RT BLACK HOLES PENUMBRA RT ECLIPSES LUNAR ECLIPSE PENUMBRAL FILAMENTS SOLAR ECLIPSE SUNSPOTS UMBRA WILSON EFFECT PENUMBRAL FILAMENTS RT PENUMBRA PERIAPSIS RT PERIASTRON PERIHELION PERIASTRON BT APSIDES RT APASTRON PERIAPSIS PERICENTER RT CENTER OF MASS PERIGEE BT APSIDES RT APOGEE EARTH MOON PERIHELION BT APSIDES RT APHELION EARTH ORBIT PERIAPSIS PLANETS PERIOD BT ORBITAL ELEMENTS PHOTOMETRIC ELEMENTS RT BINARY STARS CYCLE LIGHT CURVES ORBITS PHASE [WAVE] PLANETS PULSATING VARIABLE STARS PULSATION MODES ROTATION VARIABLE STARS VELOCITY CURVES PERIOD AGE RELATION RT CEPHEIDS PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PERIOD CHANGE UF period variation RT BINARY STARS PULSATING VARIABLE STARS PERIOD COLOR RELATION RT CEPHEIDS PERIOD AGE RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD DENSITY RELATION RT PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD DETERMINATION RT BINARY STARS VARIABLE STARS WAVEFORM ANALYSIS PERIOD LUMINOSITY COLOR RELATION UF plc relation RT CEPHEIDS PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD LUMINOSITY RELATION UF pl relation RT CEPHEIDS PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD MASS RELATION RT PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD RADIUS RELATION RT CEPHEIDS PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD SPECTRUM RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION PERIOD SPECTRUM RELATION RT CEPHEIDS PERIOD AGE RELATION PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PULSATING VARIABLE STARS RADIUS LUMINOSITY RELATION period variation U PERIOD CHANGE PERIODIC COMETS BT COMETS PERIODIC ORBITS BT ORBITS NT ELLIPTICAL ORBITS PERIPHERALS Combine with other terms RT COMPUTERS INSTRUMENTATION perot fabry interferometers U FABRY PEROT INTERFEROMETERS PERTURBATION RT CELESTIAL MECHANICS N BODY PROBLEM ORBITS OSCULATORY ELEMENTS PERTURBATION THEORY THREE BODY PROBLEM PERTURBATION THEORY RT CELESTIAL MECHANICS GRAVITATION ORBITS PERTURBATION PETROLOGY BT GEOLOGY RT PLANETS SURFACES [CELESTIAL BODIES] PFUND SERIES BT INFRARED RADIATION RT BALMER SERIES BRACKETT SERIES HYDROGEN SPECTRUM LYMAN SERIES PASCHEN SERIES PHASE ANGLE RT MOON PHASE [MOON] PLANETS PHASE DEFECT RT MOON OBLIQUITY OF ECLIPTIC PHASE [MOON] PHASE DIFFERENCE RT PHASE [WAVE] PHASE EFFECTS RT PHASE [MOON] PHASE ERRORS RT PHASE [WAVE] PHASE FUNCTION RT PHASE [WAVE] RADIATION SCATTERING PHASE ROTATOR RT PHASE [WAVE] RADIO TELESCOPES PHASE SENSITIVE DETECTORS RT PHASE SWITCHING INTERFEROMETERS PHASE [WAVE] RECEIVERS PHASE SHIFT RT LIGHT CURVES PHASE [WAVE] VARIABLE STARS VELOCITY CURVES PHASE SPACE RT PHASE [WAVE] VELOCITY SPACE PHASE SWITCHING RT PHASE [WAVE] RADIO TELESCOPES RECEIVERS PHASE SWITCHING INTERFEROMETERS BT INTERFEROMETERS RT PHASE SENSITIVE DETECTORS PHASE [WAVE] PHASE [MOON] Of the moon. UF lunar phases RT ILLUMINATION METONIC CYCLE PHASE ANGLE PHASE DEFECT PHASE EFFECTS SAROS CYCLE TERMINATOR LINES PHASE [WAVE] Of a repeating wave. RT BINARY STARS LIGHT CURVES PERIOD PHASE DIFFERENCE PHASE ERRORS PHASE FUNCTION PHASE ROTATOR PHASE SENSITIVE DETECTORS PHASE SHIFT PHASE SPACE PHASE SWITCHING PHASE SWITCHING INTERFEROMETERS PHASED ARRAYS VARIABLE STARS VELOCITY CURVES PHASED ARRAYS BT ARRAYS RT PHASE [WAVE] RADIO INTERFEROMETERS PHILLIPS BANDS BT INFRARED RADIATION MOLECULAR BANDS MOLECULAR SPECTRA PHOSPHORESCENCE RT IMAGE TUBES PHOSPHORESCENT SCINTILLATION SCINTILLATION COUNTERS PHOSPHORESCENT SCINTILLATION BT SCINTILLATION RT COSMIC RAY SHOWERS IMAGE TUBES PHOSPHORESCENCE SCINTILLATION COUNTERS PHOTOCATHODES BT CATHODES ELECTRODES RT IMAGE TUBES PHOTOMULTIPLIER TUBES photocells U PHOTOMULTIPLIER TUBES PHOTOCHEMISTRY RT PHOTOGRAPHIC DEVELOPERS PHOTOGRAPHIC MATERIALS PHOTOGRAPHIC PROCESSING PHOTOCONDUCTIVE CELLS RT PHOTOMULTIPLIER TUBES PHOTODIODES BT PHOTOELECTRONIC DEVICES NT AVALANCHE PHOTODIODES RT PHOTOMETRY PHOTODISSOCIATION RT ABSORPTION photoelectric cells U PHOTOMULTIPLIER TUBES photoelectric image tubes U IMAGE TUBES PHOTOELECTRIC INSTRUMENTS NT IMAGE TUBES PHOTOMULTIPLIER TUBES PHOTOELECTRIC MAGNITUDES BT APPARENT MAGNITUDES RT PHOTOGRAPHIC MAGNITUDES PHOTOVISUAL MAGNITUDES PHOTOELECTRIC PHOTOMETERS BT PHOTOMETERS PHOTOELECTRIC PHOTOMETRY BT PHOTOMETRY NT BROAD BAND PHOTOMETRY MEDIUM BAND PHOTOMETRY NARROW BAND PHOTOMETRY RT CCD PHOTOMETRY PHOTOGRAPHIC PHOTOMETRY PHOTOELECTRONIC DEVICES NT AVALANCHE PHOTODIODES CHARGE COUPLED DEVICES CHARGE INJECTION DEVICES CHARGE TRANSFER DEVICES IMAGE TUBES PHOTODIODES PHOTOMULTIPLIER TUBES TELEVISION DETECTORS PHOTOGRAMMETRY RT MAPS PHOTOGRAPHS PHOTOGRAPHY PHOTOGRAPHIC ASTROMETRY BT ASTROMETRY RT PROPER MOTIONS PHOTOGRAPHIC DEVELOPERS RT PHOTOCHEMISTRY PHOTOGRAPHIC PROCESSING PHOTOGRAPHS PHOTOGRAPHIC EMULSIONS BT DETECTORS PHOTOGRAPHIC MATERIALS RT HALATION PHOTOGRAPHIC FILMS PHOTOGRAPHIC PLATES PHOTOGRAPHS PHOTOGRAPHY QUANTUM EFFICIENCY TURBIDITY PHOTOGRAPHIC FILMS UF films [photographic] BT PHOTOGRAPHIC MATERIALS RT PHOTOGRAPHIC EMULSIONS PHOTOGRAPHS PHOTOGRAPHY PHOTOGRAPHIC FILTERS BT OPTICAL FILTERS PHOTOGRAPHIC INSTRUMENTS NT CAMERAS SCHMIDT CAMERAS SCHMIDT TELESCOPES PHOTOGRAPHIC MAGNITUDES BT APPARENT MAGNITUDES RT PHOTOELECTRIC MAGNITUDES PHOTOVISUAL MAGNITUDES PHOTOGRAPHIC MATERIALS NT PHOTOGRAPHIC EMULSIONS PHOTOGRAPHIC FILMS PHOTOGRAPHIC PLATES RT PHOTOCHEMISTRY PHOTOGRAPHS PHOTOGRAPHIC PHOTOMETRY BT PHOTOMETRY NT BROAD BAND PHOTOMETRY RT CCD PHOTOMETRY PHOTOELECTRIC PHOTOMETRY PHOTOGRAPHIC PLATES BT PHOTOGRAPHIC MATERIALS RT PHOTOGRAPHIC EMULSIONS PHOTOGRAPHS PHOTOGRAPHY RESEAUX PHOTOGRAPHIC PROCESSING RT DARKROOMS PHOTOCHEMISTRY PHOTOGRAPHIC DEVELOPERS PHOTOGRAPHY UNSHARP MASKING photographic zenith tubes U ZENITH TELESCOPES zenith tubes PHOTOGRAPHS BT IMAGES RT CAMERAS MICRODENSITOMETERS PHOTOGRAMMETRY PHOTOGRAPHIC DEVELOPERS PHOTOGRAPHIC EMULSIONS PHOTOGRAPHIC FILMS PHOTOGRAPHIC MATERIALS PHOTOGRAPHIC PLATES PHOTOGRAPHY UF astrophotography NT ALL SKY PHOTOGRAPHY COLOR PHOTOGRAPHY FALSE COLOR PHOTOGRAPHY STREAK PHOTOGRAPHY ULTRAVIOLET PHOTOGRAPHY RT ASTRONOMICAL TECHNIQUES CAMERAS DARKROOMS EDGE EFFECTS HD CURVE IMAGES MICROPHOTOMETERS OBSERVING TECHNIQUES PHOTOGRAMMETRY PHOTOGRAPHIC EMULSIONS PHOTOGRAPHIC FILMS PHOTOGRAPHIC PLATES PHOTOGRAPHIC PROCESSING SPECTROGRAPHY UNSHARP MASKING PHOTOHELIOGRAPHS RT SPECTROHELIOGRAPHS PHOTOIONIZATION BT IONIZATION RT ABSORPTION AURORAS ELECTRONS RECOMBINATION PHOTOLUMINESCENCE BT LIGHT EMISSION NT X RAY FLUORESCENCE RT FLUORESCENCE PHOTOMETERS BT OPTICAL INSTRUMENTS TELESCOPE INSTRUMENTATION NT HIGH SPEED PHOTOMETERS PHOTOELECTRIC PHOTOMETERS SPECTROPHOTOMETERS RT BOLOMETERS CCD DETECTORS INFRARED DETECTORS PHOTOMETRY PHOTOMULTIPLIER TUBES POLARIMETERS RADIOMETERS ULTRAVIOLET DETECTORS photometric binary stars U ECLIPSING BINARY STARS ELLIPSOIDAL VARIABLE STARS PHOTOMETRIC ELEMENTS NT LIGHT CURVES MAXIMA MINIMA PERIOD RT ECLIPSING BINARY STARS PHOTOMETRIC PARALLAX BT PARALLAXES RT PHOTOMETRY PHOTOMETRIC STANDARD STARS BT STANDARD STARS RT PHOTOMETRY STANDARD CANDLES PHOTOMETRIC SYSTEMS NT CAPE PHOTOMETRY DDO PHOTOMETRY GENEVA PHOTOMETRY JOHNSON PHOTOMETRY STROMGREN PHOTOMETRY WALRAVEN PHOTOMETRY RT APPARENT MAGNITUDES PHOTOMETRY PHOTOMETRY Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. UF filter photometry multicolor photometry BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES NT CCD PHOTOMETRY INFRARED PHOTOMETRY PHOTOELECTRIC PHOTOMETRY PHOTOGRAPHIC PHOTOMETRY SURFACE PHOTOMETRY ULTRAVIOLET PHOTOMETRY RT APPARENT MAGNITUDES AUTOMATIC PATROL TELESCOPES AVALANCHE PHOTODIODES COLOR COLOR EQUATION COLOR EXCESSES COLOR INDICES COLOR LUMINOSITY RELATION COLOR MAGNITUDE RELATION DRIFT SCANS E REGIONS EFFECTIVE TEMPERATURE F REGIONS INTERFERENCE FILTERS INTRINSIC COLORS MAGNITUDES OPTICAL FILTERS PHOTODIODES PHOTOMETERS PHOTOMETRIC PARALLAX PHOTOMETRIC STANDARD STARS PHOTOMETRIC SYSTEMS POLARIMETRY PURKINJE EFFECT SPECTROPHOTOMETRY STANDARD CANDLES TWO COLOR DIAGRAMS PHOTOMULTIPLIER TUBES UF cells photocells photoelectric cells BT DETECTORS PHOTOELECTRIC INSTRUMENTS PHOTOELECTRONIC DEVICES RT AMPLIFIERS CATHODES ELECTRODES INSTRUMENTATION PHOTOCATHODES PHOTOCONDUCTIVE CELLS PHOTOMETERS QUADRANT DETECTORS QUANTUM EFFICIENCY SCINTILLATION COUNTERS PHOTON COUNTING SYSTEMS RT COUNTERS PHOTONS BT BOSONS ELEMENTARY PARTICLES RT ELECTROMAGNETIC WAVES INVERSE COMPTON EFFECT INVERSE COMPTON SCATTERING MESONS QUANTUM RADIATION RADIATION PRESSURE RADIATIVE RECOMBINATION PHOTOSPHERE UF reversing layer RT CHROMOSPHERE CONTINUUM RADIATION FACULAE GRANULATION GRANULES SOLAR SURFACE SUN SURFACE BRIGHTNESS SURFACES [CELESTIAL BODIES] PHOTOVISUAL MAGNITUDES BT APPARENT MAGNITUDES RT PHOTOELECTRIC MAGNITUDES PHOTOGRAPHIC MAGNITUDES V MAGNITUDE VISUAL MAGNITUDE PHOTOVOLTAIC CELLS BT SEMICONDUCTOR DEVICES physical libration U LIBRATION picture element U PIXEL PIONS BT BOSONS ELEMENTARY PARTICLES PITCH ANGLE RT GALACTIC STRUCTURE SPIRAL ARMS SPIRAL GALAXIES PIXEL UF picture element RT DETECTORS RESOLUTION TWO DIMENSIONAL DETECTORS pl relation U PERIOD LUMINOSITY RELATION PLAGES UF flocculi solar plages RT CHROMOSPHERE FACULAE SUNSPOTS PLANCK BLACK BODY FORMULA RT PLANCK CONSTANT RADIATION PLANCK CONSTANT RT PLANCK BLACK BODY FORMULA PLANE POLARIZATION BT POLARIZATION [WAVES] RT CIRCULAR POLARIZATION PLANET SATELLITES BT SATELLITES PLANETARIA RT MOTION OBSERVATORIES ORRERIES PLANETARY See SN for PLANETS. PLANETARY NEBULAE BT EMISSION NEBULAE EVOLVED STARS NEBULAE RT ANSAE CENTRAL STARS EMISSION LINE STARS EXCITING STARS HARMAN SEATON SEQUENCE MASS LOSS RING NEBULAE PLANETARY RINGS BT RINGS RT PLANETS RESONANCE GAPS RING DIVISIONS ROCHE LIMIT SHEPHERD SATELLITES PLANETARY SYSTEMS NT SOLAR SYSTEM PLANETARY THEORY RT CELESTIAL MECHANICS SOLAR SYSTEM PLANETESIMALS RT MINOR PLANETS PLANETS PROTOPLANETS SATELLITES SOLAR SYSTEM planetoids U MINOR PLANETS PLANETOLOGY RT GEOLOGY PLANETS Combine either PLANET or PLANETARY with other terms. NT EARTH EXTRASOLAR PLANETS GIANT PLANETS HYPOTHETICAL PLANETS INNER PLANETS OUTER PLANETS RT AERONOMY ALIGNMENT [PLANETS] APHELION ASTROLOGY ATMOSPHERES BODES LAW BOUNDARY LAYERS CENTER OF MASS COLLISIONS COMPOSITION CORES CRATERS CRUST DUST STORMS EQUATORIAL BULGE EVOLUTION EXOSPHERE GALILEAN SATELLITES GEOLOGY GEOMAGNETISM GREENHOUSE EFFECT INTERIORS LITHOSPHERES MANTLES MAPS MEAN EQUINOX OBLATENESS OCCULTATIONS ORBIT DETERMINATION ORBITS ORIGIN PERIHELION PERIOD PETROLOGY PHASE ANGLE PLANETARY RINGS PLANETESIMALS POLAR CAPS POLAR REGIONS PROTOPLANETS RESONANCE GAPS RILLES RING DIVISIONS ROCHE LIMIT SATELLITES SEMIMAJOR AXIS SOLAR NEBULA SOLAR PLANETARY RELATIONS SOLAR SYSTEM SPACE EXPLORATION STRUCTURE SURFACES [CELESTIAL BODIES] SYNODIC PERIOD SYZYGY TOPOGRAPHY TWO BODY PROBLEM VOLATILES VOLCANOES WATER ICE WATER VAPOR PLASMA CLOUDS BT CLOUDS RT IONS PLASMA JETS PLASMAS PLASMA JETS BT JETS RT IONS PLASMA CLOUDS PLASMA LOOPS PLASMAS PLASMA LOOPS RT PLASMA JETS PLASMAS PLASMA PHYSICS RT MAGNETOHYDRODYNAMICS PLASMAS PLASMA WAVES RT ION PLASMA WAVES MAGNETOHYDRODYNAMICS PLASMAS PLASMAPAUSE RT PLASMAS PLASMAS UF cosmic plasmas BT PARTICLES NT COLLISIONAL PLASMAS LOW TEMPERATURE PLASMAS RELATIVISTIC PLASMAS SOLAR WIND STELLAR WINDS RT ELEMENTARY PARTICLES ENERGETIC PARTICLES H II REGIONS HOLTSMARK APPROXIMATION IONIZED GASES IONS PLASMA CLOUDS PLASMA JETS PLASMA LOOPS PLASMA PHYSICS PLASMA WAVES PLASMAPAUSE RADIATION BELTS RADIATIVE RECOMBINATION THERMODYNAMICS VISCOSITY plc relation U PERIOD LUMINOSITY COLOR RELATION POGSON SCALE RT MAGNITUDES POINCARE THEOREM RT STAR CLUSTERS STELLAR DYNAMICS POINT SPREAD FUNCTION RT ATMOSPHERIC REFRACTION SEEING TURBULENCE [EARTH ATMOSPHERE] POINTING ACCURACY RT CONTROL SYSTEMS POINTING ERRORS TELESCOPES TRACKING POINTING ERRORS RT CONTROL SYSTEMS POINTING ACCURACY TELESCOPES TRACKING POLAR AXIS RT CELESTIAL POLES TELESCOPE MOUNTINGS POLAR CAPS RT EARTH PLANETS POLAR DIAGRAM RT ANTENNA DESIGN BEAMWIDTH RADIO ANTENNAS SENSITIVITY SIDELOBES POLAR MOTION BT MOTION RT CHANDLER WOBBLE EARTH ROTATION LATITUDE VARIATION NUTATION PRECESSION POLAR ORBITS BT ORBITS RT ARTIFICIAL SATELLITES POLAR REGIONS RT PLANETS POLAR TIDES BT TIDES polar wandering U CHANDLER WOBBLE POLARIMETERS BT OPTICAL INSTRUMENTS TELESCOPE INSTRUMENTATION RT PHOTOMETERS POLARIMETRY POLARIMETRY BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES RT PHOTOMETRY POLARIMETERS POLARIZATION [WAVES] POLARIZATION [CHARGE SEPARATION] BT MAGNETO OPTICAL EFFECTS RT ANISOTROPY IONS POLARIZATION [WAVES] UF light polarization NT CIRCULAR POLARIZATION PLANE POLARIZATION X RAY POLARIZATION RT ELECTROMAGNETIC WAVES FARADAY EFFECT OPTICAL PROPERTIES POLARIMETRY POLARIZED LIGHT POLARIZED RADIATION RADIATION SCATTERING STOKES PARAMETERS POLARIZED LIGHT BT LIGHT RT POLARIZATION [WAVES] POLARIZED RADIATION BT RADIATION RT FARADAY EFFECT POLARIZATION [WAVES] STOKES PARAMETERS X RAY POLARIZATION polars U AM HERCULIS STARS POLES NT CELESTIAL POLES ECLIPTIC POLES GALACTIC POLES NADIR ZENITH POLISHING NT FIGURING RT LENSES MIRRORS SURFACES [OPTICAL] POLLUTION NT AIR POLLUTION LIGHT POLLUTION SPACE POLLUTION RT GREENHOUSE EFFECT SITE TESTING POLYCYCLIC HYDROCARBON BT HYDROCARBONS POLYTROPES RT MODELS STELLAR STRUCTURE POPULATION I STARS UF extreme population I stars NT YOUNG STARS RT OPEN STAR CLUSTERS SPIRAL ARMS STELLAR POPULATIONS YOUNG STAR CLUSTERS POPULATION II CEPHEIDS BT POPULATION II STARS NT RR LYRAE STARS W VIRGINIS STARS POPULATION II STARS BT OLD STARS NT DISK POPULATION DISK STARS HALO STARS HORIZONTAL BRANCH STARS POPULATION II CEPHEIDS SX PHOENICIS STARS RT GALACTIC HALO GALACTIC NUCLEI GLOBULAR STAR CLUSTERS INTERMEDIATE POPULATION STARS STELLAR POPULATIONS SUBLUMINOUS STARS POPULATION INVERSION RT ATOMIC PROCESSES LASERS MASERS STIMULATED EMISSION POSITION ANGLE BT ORBITAL ELEMENTS RT BINARY STARS ORBITS ORIENTATION positional astronomy U ASTROMETRY POSITIONS Combine with other terms NT APPARENT POSITIONS TRUE POSITIONS RT COORDINATE SYSTEMS FUNDAMENTAL SYSTEM REFERENCE SYSTEMS SPHERICAL COORDINATES STANDARD STARS POSITRONS BT ANTIPARTICLES LEPTONS NUCLEAR RADIATION PARTICLES RT ELECTRONS PAIR ANNIHILATION PAIR PRODUCTION RADIOACTIVITY POSTMAINSEQUENCE STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. Excluding advanced evolution. BT EVOLVED STARS NONMAINSEQUENCE STARS NT GIANT STARS SUBGIANT STARS SUPERGIANT STARS POTENTIAL ENERGY BT ENERGY RT KINETIC ENERGY POTENTIAL THEORY In mathematics. POWER Combine with other terms POYNTING ROBERTSON EFFECT RT RADIATION PRESSURE SOLAR WIND STELLAR WINDS PREAMPLIFIERS BT AMPLIFIERS PRECESSION RT ASTROMETRY CELESTIAL MECHANICS EARTH ROTATION EQUATION OF THE EQUINOXES NUTATION OBLIQUITY OF ECLIPTIC POLAR MOTION PRECISION Combine with other terms RT LIMITING MAGNITUDES SENSITIVITY PRECURSOR PULSE RT PULSARS precursors U PROGENITORS PREDICTIONS Combine with other terms RT FORECASTS PREGALACTIC STARS BT OLD STARS PREMAINSEQUENCE STARS UF early stage stars BT NONMAINSEQUENCE STARS YOUNG STARS NT FLASH STARS HERBIG HARO OBJECTS PROTOSTARS RW AURIGAE STARS T TAURI STARS RT ORION POPULATION STARS STAR FORMATION T ASSOCIATIONS prenovas U NOVAS PROGENITORS PRESOLAR NEBULA RT SOLAR SYSTEM PRESSURE Combine with other terms RT RADIATION PRESSURE RANKINE HUGONIOT RELATIONS VACUUM PRESSURE BROADENING BT LINE BROADENING RT DOPPLER BROADENING LINE SPECTRA NATURAL LINE WIDTH SPECTROSCOPY ZEEMAN SPLITTING presupernovas U PROGENITORS SUPERNOVAS primary cosmic rays U COSMIC RAYS PRIMARY LENSES BT LENSES OBJECTIVES RT REFRACTING TELESCOPES PRIMARY MIRRORS BT MIRRORS OBJECTIVES TELESCOPE MIRRORS RT REFLECTING TELESCOPES SECONDARY MIRRORS PRIME FOCUS BT FOCUS RT CASSEGRAIN FOCUS COUDE FOCUS NASMYTH FOCUS PRIMORDIAL FIREBALL BT COSMOLOGY RT BIG BANG THEORY PRIMORDIAL GALAXIES BT GALAXIES PRISM SPECTROGRAPHS BT SPECTROGRAPHS RT GRATING SPECTROGRAPHS PRISMS PRISMS NT OBJECTIVE PRISMS RT GRISMS OPTICAL INSTRUMENTS PRISM SPECTROGRAPHS SPECTRA SPECTROGRAPHS probes U SPACE PROBES profiles U LINE PROFILES PROGENITORS UF precursors prenovas presupernovas RT NOVAS SUPERNOVAS PROMINENCES UF chromospheric eruptions NT ACTIVE PROMINENCES QUIESCENT PROMINENCES RT CHROMOSPHERE FILAMENTS [SOLAR] FLARES HANLE EFFECT OPTICAL FLARES SOLAR ACTIVITY SUN SUNSPOTS PROPAGATION Combine with other terms PROPER MOTIONS BT MOTION SPACE MOTION RT GALACTIC ROTATION KINEMATICS LOCAL STANDARD OF REST MOVING CLUSTER PARALLAX PECULIAR MOTIONS PHOTOGRAPHIC ASTROMETRY RADIAL VELOCITY RADIANT [MOVING CLUSTER] SECULAR PARALLAX STELLAR DYNAMICS STELLAR MOTIONS TRANSVERSE VELOCITY PROPERTIES Combine with other terms NT MAGNETIC PROPERTIES MECHANICAL PROPERTIES OPTICAL PROPERTIES SURFACE PROPERTIES THERMAL PROPERTIES PROPORTIONAL COUNTERS BT MEASURING INSTRUMENTS RT X RAY DETECTORS PROTOCLUSTERS BT CLUSTERS RT CLUSTERS OF GALAXIES COLLAPSING CLOUDS COSMOGONY COSMOLOGY STAR CLUSTERS PROTOGALAXIES BT GALAXIES GASEOUS SPHERES RT COLLAPSING CLOUDS COSMOGONY COSMOLOGY proton proton cycle U PROTON PROTON REACTION PROTON PROTON REACTION UF proton proton cycle BT HYDROGEN BURNING RT CARBON NITROGEN CYCLE NUCLEAR FUSION STELLAR INTERIORS PROTONS BT FUNDAMENTAL PARTICLES PARTICLES RT ALPHA PARTICLES ANTIPROTONS NUCLEI [ATOMS] PROTOPLANETARY NEBULAS BT COLLAPSING CLOUDS RT COSMOGONY PROTOPLANETS SOLAR NEBULA PROTOPLANETS RT PLANETESIMALS PLANETS PROTOPLANETARY NEBULAS SATELLITES SOLAR NEBULA SOLAR SYSTEM PROTOSTARS BT GASEOUS SPHERES PREMAINSEQUENCE STARS RT BIRTH RATES BOK GLOBULES COLLAPSING CLOUDS HERBIG HARO OBJECTS STAR FORMATION STELLAR EVOLUTION T TAURI STARS PULSARS BT COLLAPSED STARS DEGENERATE STARS EVOLVED STARS RADIO SOURCES RELATIVISTIC STARS NT BINARY PULSARS OPTICAL PULSARS RADIO PULSARS X RAY PULSARS RT FREQUENCY SHIFT NEUTRON STARS PRECURSOR PULSE PULSE DURATION PULSE ENERGIES PULSE INTENSITY PULSE PROFILES PULSE STRUCTURE PULSE WIDTH PULSE WINDOW RAPID OSCILLATIONS SUPERNOVA REMNANTS SUPERNOVAS PULSATING VARIABLE STARS BT INTRINSIC VARIABLE STARS VARIABLE STARS NT 53 PERSEI STARS BETA CEPHEI STARS BL HERCULIS STARS CEPHEIDS DELTA DELPHINI STARS DELTA SCUTI STARS DOUBLE MODE CEPHEIDS DOUBLE MODE VARIABLE STARS DWARF CEPHEIDS IRREGULAR VARIABLE STARS LAMBDA ERIDANI STARS LONG PERIOD VARIABLE STARS MIRA VARIABLE STARS MULTIPERIODIC VARIABLE STARS RR LYRAE STARS RV TAURI STARS S VULPECULAE STARS SEMIREGULAR VARIABLE STARS SX PHOENICIS STARS W VIRGINIS STARS ZZ CETI STARS RT ASTEROSEISMOLOGY DOUBLE MODE PULSATION HE+ IONIZATION ZONE KAPPA MECHANISM MULTIPERIODIC PULSATION NONRADIAL PULSATIONS OVERTONE MODES PERIOD PERIOD CHANGE PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION PULSATION MODES PULSATION THEORY PULSATION MODES NT FUNDAMENTAL MODE OVERTONE MODES RT MULTIPERIODIC PULSATION MULTIPERIODIC VARIABLE STARS NONRADIAL PULSATIONS PERIOD PULSATING VARIABLE STARS PULSATION THEORY PULSATIONS PULSATION THEORY RT HE+ IONIZATION ZONE PULSATING VARIABLE STARS PULSATION MODES PULSATIONS Combine with other terms RT AMPLITUDES ASTEROSEISMOLOGY PULSATION MODES PULSE COUNTERS RT AMPLIFIERS PULSES PULSE COUNTING RT AMPLIFIERS PULSES PULSE DURATION RT PULSARS PULSES PULSE ENERGIES RT PULSARS PULSES PULSE INTENSITY RT PULSARS PULSES PULSE PROFILES RT PULSARS PULSES PULSE STRUCTURE RT PULSARS PULSES PULSE WIDTH RT PULSARS PULSES PULSE WINDOW RT PULSARS PULSES PULSES Combine with other terms RT PULSE COUNTERS PULSE COUNTING PULSE DURATION PULSE ENERGIES PULSE INTENSITY PULSE PROFILES PULSE STRUCTURE PULSE WIDTH PULSE WINDOW PURKINJE EFFECT RT PHOTOMETRY VARIABLE STARS VISUAL MAGNITUDE VISUAL OBSERVATIONS Q BRANCH RT MOLECULAR SPECTRA VIBRATIONAL SPECTRA Q MAGNITUDE BT APPARENT MAGNITUDES RT FAR INFRARED RADIATION INFRARED PHOTOMETRY qso U QUASARS QUADRANT DETECTORS RT AUTOGUIDERS CONTROL SYSTEMS GUIDE SYSTEMS PHOTOMULTIPLIER TUBES QUADRANTS BT ASTROMETRIC INSTRUMENTS INSTRUMENTATION RT MERIDIAN CIRCLES QUADRATURE RT CONJUNCTION OPPOSITION quanta U QUANTUM QUANTIZATION RT ANALYSES DETERMINATION MEASUREMENT QUANTUM UF quanta RT PHOTONS QUANTUM THEORY QUANTUM COSMOLOGY BT COSMOLOGY RT NAKED SINGULARITY SPACETIME SINGULARITY QUANTUM EFFICIENCY RT CATHODES CHARGE COUPLED DEVICES DETECTORS IMAGE TUBES PHOTOGRAPHIC EMULSIONS PHOTOMULTIPLIER TUBES QUANTUM FIELD THEORY RT ELECTROMAGNETIC FIELDS GRAVITATIONAL FIELDS QUANTUM THEORY QUANTUM MECHANICS RT FERMI DIRAC STATISTICS QUANTUM THEORY RELATIVISTIC VELOCITY QUANTUM THEORY RT QUANTUM QUANTUM FIELD THEORY QUANTUM MECHANICS QUARKS BT ELEMENTARY PARTICLES RT BARYONS LEPTONS MESONS NEUTRON STARS QUASAR GALAXY PAIRS RT GALAXIES QUASARS QUASARS UF qso quasi stellar galaxies quasi stellar objects quasi stellar radio sources BT EXTRAGALACTIC OBJECTS EXTRAGALACTIC RADIO SOURCES NT RADIO QUIET QUASARS X RAY QUASARS RT ACTIVE GALACTIC NUCLEI BL LACERTAE OBJECTS BLAZARS COMPACT GALAXIES DOUBLE QUASARS LUMINOUS ARCS LYMAN ALPHA FOREST QUASAR GALAXY PAIRS VARIABLE SOURCES X RAY SOURCES quasi stellar galaxies U QUASARS quasi stellar objects U QUASARS quasi stellar radio sources U QUASARS QUIESCENT PROMINENCES BT PROMINENCES RT CHROMOSPHERE SUN QUIET SUN RT ACTIVE SUN SOLAR CYCLE R ASSOCIATIONS BT STAR ASSOCIATIONS RT REFLECTION NEBULAE YOUNG STARS R CANIS MAJORIS STARS UF rcma stars BT ECLIPSING BINARY STARS R CORONAE BOREALIS STARS UF rcb stars BT IRREGULAR VARIABLE STARS RT CIRCUMSTELLAR DUST CIRCUMSTELLAR GRAINS SUPERGIANT STARS R MAGNITUDE BT APPARENT MAGNITUDES RT JOHNSON PHOTOMETRY r PROCESS RT NUCLEOSYNTHESIS p PROCESS s PROCESS SUPERNOVAS R STARS BT GIANT STARS LATE TYPE STARS RT CARBON STARS SPECTRAL TYPES RADAR NT OPTICAL RADAR RT ANTENNAS DOPPLER EFFECT RADAR ASTRONOMY RADAR ASTRONOMY BT RADIO ASTRONOMY RT RADAR RADAR EQUIPMENT RADAR TELESCOPES RADIO OBSERVATORIES RADAR EQUIPMENT NT ANTENNAS RT RADAR ASTRONOMY RADIO TELESCOPES RADAR MAPPING RT MAPS RADAR TELESCOPES BT RADIO TELESCOPES RT DISH ANTENNAS PARABOLIC REFLECTORS RADAR ASTRONOMY RADIAL PULSATIONS RT BETA CEPHEI STARS BL HERCULIS STARS CEPHEIDS DELTA SCUTI STARS HE+ IONIZATION ZONE MIRA VARIABLE STARS RV TAURI STARS RADIAL VELOCITY BT SPACE MOTION VELOCITY RT DOPPLER EFFECT KINEMATICS LINE SHIFT PECULIAR MOTIONS PECULIAR VELOCITY PROPER MOTIONS REDSHIFT SPECTROMETRY STELLAR DYNAMICS STELLAR MOTIONS TANGENTIAL VELOCITY TRANSVERSE VELOCITY VIRIAL THEOREM RADIANT [METEORS] RT METEOR SHOWERS METEOR STREAMS METEOR TRAILS METEORS RADIANT [MOVING CLUSTER] RT MOVING CLUSTER PARALLAX OPEN STAR CLUSTERS PROPER MOTIONS RADIATION Combine with other terms UF electromagnetic radiation NT BACKGROUND RADIATION BLACK BODY RADIATION BREMSSTRAHLUNG CERENKOV RADIATION CONTINUUM RADIATION COSMIC RAYS CYCLOTRON RADIATION GAMMA RAYS GRAVITATIONAL RADIATION HIGH ENERGY RADIATION INFRARED RADIATION MICROWAVE RADIATION POLARIZED RADIATION RADIO RADIATION SYNCHROTRON RADIATION THERMAL RADIATION ULTRAVIOLET RADIATION VISIBLE RADIATION X RAYS RT ABSORPTION ALBEDO BOLOMETERS EFFECTIVE TEMPERATURE EMISSIVITY ENERGY TRANSFER FLUX DENSITY ILLUMINATION IRRADIANCE OPACITY PHOTONS PLANCK BLACK BODY FORMULA RADIATIVE EQUILIBRIUM RECOMBINATION LINES SOLAR CONSTANT radiation background U BACKGROUND RADIATION RADIATION BELTS NT VAN ALLEN RADIATION BELTS RT ATMOSPHERES EARTH PLASMAS RADIATION DAMPING RT DAMPING CONSTANTS DECAY [OSCILLATIONS] RADIATIVE BRAKING RADIATION FIELD RT ELECTROMAGNETIC FIELDS RADIATION MECHANISMS NT FREE BOUND EMISSION FREE FREE EMISSION RT BREMSSTRAHLUNG CERENKOV RADIATION CYCLOTRON RADIATION GRAVITATIONAL RADIATION NONLTE TRANSFER RAYLEIGH LIMIT RELATIVISTIC PARTICLES RELATIVISTIC PLASMAS SYNCHROTRON RADIATION RADIATION PRESSURE RT EDDINGTON LIMIT PHOTONS POYNTING ROBERTSON EFFECT PRESSURE SOLAR WIND STELLAR WINDS RADIATION SCATTERING UF electromagnetic wave scattering NT COMPTON SCATTERING LIGHT SCATTERING RAYLEIGH SCATTERING THOMSON SCATTERING X RAY SCATTERING RT COMPTON EFFECT ELEMENTARY PARTICLE SCATTERING PHASE FUNCTION POLARIZATION [WAVES] RAMAN EFFECT SCATTERING ZODIACAL LIGHT RADIATIVE BRAKING RT DAMPING CONSTANTS DYNAMICAL FRICTION RADIATION DAMPING ROTATING STARS radiative capture U RADIATIVE RECOMBINATION RADIATIVE EQUILIBRIUM RT ABSORPTION RADIATION TEMPERATURE RADIATIVE RECOMBINATION UF radiative capture RT AIRGLOW ELECTRONS PHOTONS PLASMAS RADIATIVE TRANSFER RT OPACITY RAYLEIGH LIMIT TRANSPORT PROCESSES RADICALS BT COMPOSITE PARTICLES NT HYDROXYL RADICAL RT IONS RADIO ABSORPTION RT H I REGIONS INTERSTELLAR MATTER IONOSPHERE RADIO ANTENNAS BT ANTENNAS RT POLAR DIAGRAM RADIO TELESCOPES SIDELOBES RADIO ASTROMETRY BT ASTROMETRY OBSERVING TECHNIQUES RADIO ASTRONOMY RT INTERFEROMETRY LONG BASELINE INTERFEROMETRY VERY LONG BASELINE INTERFEROMETRY RADIO ASTRONOMY Use as NTs all terms associated with radio astronomy NT MILLIMETER ASTRONOMY RADAR ASTRONOMY RADIO ASTROMETRY SUBMILLIMETER ASTRONOMY RT CLEAN METHODS RADIO BACKGROUND UF radio frequency interference radio noise BT BACKGROUND RADIATION RT COSMIC NOISE GAMMA RAY BACKGROUND MICROWAVE BACKGROUND RADIO INTERFERENCE RADIO RADIATION ULTRAVIOLET BACKGROUND X RAY BACKGROUND RADIO BURSTS BT BURSTS RT BURSTERS GAMMA RAY BURSTS OPTICAL BURSTS X RAY BURSTS RADIO CORES RT RADIO SOURCES RADIO EMISSION See RADIO RADIATION. RADIO FLARES BT FLARES RT FLARE STARS RADIO FREQUENCIES RT PAUL TRAP RADIO SPECTRA RADIO WAVES SPECTRAL INDICES radio frequency interference U RADIO BACKGROUND RADIO INTERFERENCE RADIO GALAXIES BT EXTRAGALACTIC RADIO SOURCES GALAXIES NT Ep GALAXIES GIANT RADIO GALAXIES HEAD TAIL GALAXIES RT ACTIVE GALACTIC NUCLEI FANAROFF RILEY CLASS X RAY SOURCES RADIO INTERFERENCE UF radio frequency interference radio noise NT COSMIC NOISE RT RADIO BACKGROUND RADIO INTERFEROMETERS BT INTERFEROMETERS RADIO TELESCOPES NT LONG BASELINE INTERFEROMETERS T ARRAYS VERY LONG BASELINE INTERFEROMETERS Y ARRAYS RT ARRAYS PENCIL BEAMS PHASED ARRAYS RADIO INTERFEROMETRY RADIO OBSERVATORIES RADIO INTERFEROMETRY See RADIO INTERFEROMETERS. BT INTERFEROMETRY OBSERVING TECHNIQUES NT LONG BASELINE INTERFEROMETRY VERY LONG BASELINE INTERFEROMETRY RT INTERFERENCE [WAVES] RADIO INTERFEROMETERS TIME SYNCHRONIZATION RADIO JETS BT JETS RT RADIO SOURCES radio noise U RADIO BACKGROUND RADIO INTERFERENCE RADIO OBSERVATORIES BT OBSERVATORIES RT MILLIMETER ASTRONOMY RADAR ASTRONOMY RADIO INTERFEROMETERS RADIO TELESCOPES SUBMILLIMETER ASTRONOMY RADIO OCCULTATIONS BT OCCULTATIONS RADIO PULSARS BT PULSARS RT OPTICAL PULSARS RADIO QUIET QUASARS BT QUASARS RADIO RADIATION Synonym: RADIO EMISSION. BT RADIATION RT JANSKY RADIO BACKGROUND RADIO SOURCES RADIO WAVES RADIO RECOMBINATION LINES BT RECOMBINATION LINES NT 21 CM LINE RT EMISSION LINES H I REGIONS H II REGIONS MASERS RADIO SOURCE CATALOGS Combine with other terms BT CATALOGS RT RADIO SOURCE COUNTS RADIO SOURCE COUNTS RT OBSERVATIONAL COSMOLOGY RADIO SOURCE CATALOGS RADIO SOURCES STATISTICS SURVEYS RADIO SOURCES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT COMPACT SOURCES DISCRETE RADIO SOURCES EXTENDED SOURCES EXTRAGALACTIC RADIO SOURCES HEAD TAIL GALAXIES OH SOURCES PULSARS RADIO STARS VARIABLE SOURCES RT BIPOLAR OUTFLOWS GALAXY ENCOUNTERS INTERPLANETARY SCINTILLATION INTERSTELLAR SCINTILLATION IONOSPHERIC SCINTILLATION JETS LOBES MASERS OPTICAL IDENTIFICATIONS RADIO CORES RADIO JETS RADIO RADIATION RADIO SOURCE COUNTS SiO MASERS SUPERNOVA REMNANTS RADIO SPECTRA BT SPECTRA RT MICROWAVE SPECTRA RADIO FREQUENCIES RADIO SPECTROGRAPHS RADIO SPECTROMETERS RADIO SPECTROSCOPY SPECTRAL INDICES RADIO SPECTROGRAPHS BT SPECTROGRAPHS RT RADIO SPECTRA RADIO SPECTROMETERS RADIO SPECTROSCOPY RADIO SPECTROMETERS BT SPECTROMETERS RT RADIO SPECTRA RADIO SPECTROGRAPHS RADIO SPECTROSCOPY RT RADIO SPECTRA RADIO SPECTROGRAPHS RADIO STARS BT RADIO SOURCES NT FLARE STARS RT X RAY STARS RADIO STRUCTURE NT LOBES RT BIPOLAR OUTFLOWS COMPACT SOURCES CONTOUR MAPS DRIFT SCANS EXTENDED SOURCES HEAD TAIL GALAXIES RADIO TELESCOPES Not a complete list of terms. BT TELESCOPES NT CASSEGRAIN ANTENNAS DISH ANTENNAS MILLS CROSS ANTENNAS RADAR TELESCOPES RADIO INTERFEROMETERS RADIOHELIOGRAPHS VERY LARGE ARRAYS YAGI ANTENNAS RT ANTENNA DESIGN ANTENNAS APODIZATION ARRAYS BEAM SWITCHING BEAMWIDTH FEED HORNS HALF WAVE DIPOLES INTERFEROMETERS PARABOLIC REFLECTORS PHASE ROTATOR PHASE SWITCHING RADAR EQUIPMENT RADIO ANTENNAS RADIO OBSERVATORIES RECEIVERS SHAPED REFLECTORS SUBREFLECTORS RADIO WAVEGUIDES BT WAVEGUIDES NT HORN ANTENNAS RADIO WAVES BT ELECTROMAGNETIC WAVES RT RADIO FREQUENCIES RADIO RADIATION RADIO WINDOWS Low absorption in atmosphere. BT ATMOSPHERIC WINDOWS RT INFRARED WINDOWS INTERSTELLAR MATTER OPTICAL WINDOWS RADIOACTIVITY RT ALPHA PARTICLES DECAY [RADIOACTIVE] ELECTRONS GAMMA RAYS NUCLEAR FISSION POSITRONS RADIOHELIOGRAPHS BT RADIO TELESCOPES SOLAR TELESCOPES RADIOMETERS BT DETECTORS MEASURING INSTRUMENTS RT BOLOMETERS PHOTOMETERS RADIOMETRY RADIOMETRY RT RADIOMETERS RADIUS LUMINOSITY RELATION RT CEPHEIDS PERIOD COLOR RELATION PERIOD DENSITY RELATION PERIOD LUMINOSITY COLOR RELATION PERIOD LUMINOSITY RELATION PERIOD MASS RELATION PERIOD RADIUS RELATION PERIOD SPECTRUM RELATION RAMAN EFFECT RT ABSORPTION SPECTRA EMISSION SPECTRA RADIATION SCATTERING RAMAN SCATTERING RAMAN SPECTRA RAMAN SPECTROSCOPY RAMAN SCATTERING See RAMAN EFFECT. RT RAMAN EFFECT RAMAN SPECTRA See RAMAN EFFECT. RT LIGHT SCATTERING RAMAN EFFECT RAMAN SPECTROSCOPY See RAMAN EFFECT. BT SPECTROSCOPY RT MOLECULAR SPECTRA RAMAN EFFECT RAMSDEN EYEPIECE BT EYEPIECES RANGE FINDERS BT MEASURING INSTRUMENTS RT DISTANCE RANKINE HUGONIOT RELATIONS RT DENSITY PRESSURE SHOCK WAVES RAPID BURSTS BT BURSTS RT GAMMA RAY BURSTS X RAY BURSTS RAPID OSCILLATIONS RT Ap STARS ASTEROSEISMOLOGY PULSARS RARE EARTHS RT ABUNDANCE METAL ABUNDANCE METAL LINES RAYLEIGH Solar aurora flux unit. RT AURORAS NIGHT SKY BRIGHTNESS RAYLEIGH CRITERION UF rayleigh limit RT DIFFRACTION RESOLUTION rayleigh limit Refers to optical resolution. U RAYLEIGH CRITERION RAYLEIGH LIMIT Refers to radiation mechanisms. RT RADIATION MECHANISMS RADIATIVE TRANSFER RAYLEIGH NUMBER RT CONVECTION THERMAL STABILITY RAYLEIGH SCATTERING BT LIGHT SCATTERING RADIATION SCATTERING RT AIRGLOW COMPTON SCATTERING INTERSTELLAR ABSORPTION MIE SCATTERING NIGHT SKY BRIGHTNESS THOMSON SCATTERING RAYLEIGH TAYLOR INSTABILITY BT INSTABILITIES RT FLUID MECHANICS RAYS Refers to lunar features. RT MOON RAZIN EFFECT Also Razin Tsytovich effect RT SYNCHROTRON RADIATION rcb stars U R CORONAE BOREALIS STARS rcma stars U R CANIS MAJORIS STARS real anomaly U ANOMALY RECEIVERS RT CORRELATION DETECTORS PHASE SENSITIVE DETECTORS PHASE SWITCHING RADIO TELESCOPES RECOMBINATION RT ELECTRONS PHOTOIONIZATION RECOMBINATION LINES RECOMBINATION LINES BT EMISSION LINES NT RADIO RECOMBINATION LINES RT RADIATION RECOMBINATION SPECTRA RECURRENT NOVAS BT NOVAS RT FAST NOVAS SLOW NOVAS RED DWARF FLARE STARS BT FLARE STARS LATE TYPE DWARF STARS RED DWARF STARS See LATE TYPE DWARF STARS RED GIANT STARS See LATE TYPE GIANT STARS RED GIANT TIP BT GIANT BRANCH RT CARBON FLASH EVOLVED STARS HELIUM FLASH HERTZSPRUNG RUSSELL DIAGRAM LATE TYPE GIANT STARS RED STARS See either LATE TYPE STARS or REDDENED STARS RED SUPERGIANT STARS See LATE TYPE SUPERGIANT STARS REDDENED STARS RT ABSORPTION INTERSTELLAR ABSORPTION INTERSTELLAR REDDENING REDDENING REDDENING LAW REDDENING NT INTERSTELLAR REDDENING RT ABSORPTION INTERGALACTIC ABSORPTION INTERSTELLAR ABSORPTION INTERSTELLAR DUST INTERSTELLAR GAS INTRINSIC COLORS REDDENED STARS SELECTIVE ABSORPTION REDDENING LAW RT GAS TO DUST RATIO INTERSTELLAR REDDENING REDDENED STARS SELECTIVE ABSORPTION REDSHIFT BT DOPPLER EFFECT LINE SHIFT NT GRAVITATIONAL REDSHIFT RT COSMOLOGICAL DISTANCE SCALE COSMOLOGY FREQUENCY SHIFT HUBBLE DIAGRAM HUBBLE LAW K CORRECTION LYMAN ALPHA FOREST OBSERVATIONAL COSMOLOGY RADIAL VELOCITY TULLY FISHER RELATION REDSHIFT DISTANCE RELATION RT COSMOLOGICAL DISTANCE SCALE COSMOLOGY OBSERVATIONAL COSMOLOGY REDSHIFT MAGNITUDE RELATION RT COSMOLOGICAL DISTANCE SCALE COSMOLOGY HUBBLE CONSTANT HUBBLE DIAGRAM HUBBLE LAW REDUCTION METHODS RT ANALYSES ASTRONOMICAL TECHNIQUES DATA PROCESSING DATA REDUCTION REFERENCE FRAMES RT COORDINATE SYSTEMS REFERENCE SYSTEMS RT ASTROMETRY COORDINATE SYSTEMS POSITIONS SPHERICAL COORDINATES REFLECTING TELESCOPES Refers to optical telescopes. UF reflectors BT OPTICAL TELESCOPES NT BAKER NUNN CAMERAS BOUWERS TELESCOPES COELOSTATS MAKSUTOV TELESCOPES MULTIPLE MIRROR TELESCOPES RITCHEY CHRETIEN TELESCOPES SCHMIDT TELESCOPES WIDE FIELD TELESCOPES RT PARABOLIC REFLECTORS PRIMARY MIRRORS SECONDARY MIRRORS REFLECTION RT ALBEDO MIRRORS REFRACTION SCATTERING THIN FILMS TRANSMISSION REFLECTION GRATINGS BT DIFFRACTION GRATINGS RT ECHELLE GRATINGS OBJECTIVE GRATINGS TRANSMISSION GRATINGS REFLECTION NEBULAE BT INTERSTELLAR MATTER NEBULAE RT R ASSOCIATIONS REFLECTOR ANTENNAS BT ANTENNAS reflectors U REFLECTING TELESCOPES REFRACTING TELESCOPES BT OPTICAL TELESCOPES NT ZENITH TELESCOPES RT PRIMARY LENSES REFRACTION RT LENSES LIGHT REFLECTION REFRACTIVE INDEX SCATTERING TRANSMISSION WAVE PROPAGATION REFRACTIVE INDEX BT OPTICAL PROPERTIES RT ATMOSPHERIC REFRACTION LENSES OPTICAL PATHLENGTH OPTICS REFRACTION REGRESSION OF NODES RT MOON ORBITAL ELEMENTS relative sunspot number U SUNSPOT NUMBERS RELATIVISTIC ASTROPHYSICS RT BLACK HOLES COSMOLOGY GRAVITY NEUTRON STARS RELATIVISTIC COSMOLOGY RELATIVISTIC COSMOLOGY BT COSMOLOGY RT RELATIVISTIC ASTROPHYSICS RELATIVISTIC DISKS RT RELATIVISTIC EFFECTS RELATIVISTIC ELECTRONS RELATIVISTIC PLASMAS RELATIVITY RELATIVISTIC EFFECTS RT RELATIVISTIC DISKS RELATIVISTIC ELECTRONS RELATIVISTIC PLASMAS RELATIVITY RELATIVISTIC ELECTRONS BT ELECTRON BEAMS RELATIVISTIC PARTICLES RT RELATIVISTIC DISKS RELATIVISTIC EFFECTS SYNCHROTRON RADIATION RELATIVISTIC FLUID DYNAMICS BT FLUID DYNAMICS RELATIVISTIC MECHANICS relativistic gas U RELATIVISTIC PLASMAS RELATIVISTIC MECHANICS NT RELATIVISTIC FLUID DYNAMICS RT RELATIVITY RELATIVISTIC PARTICLES BT PARTICLES NT RELATIVISTIC ELECTRONS RT RADIATION MECHANISMS RELATIVISTIC PLASMAS UF relativistic gas BT GASES PLASMAS RT RADIATION MECHANISMS RELATIVISTIC DISKS RELATIVISTIC EFFECTS RELATIVITY RELATIVISTIC STARS NT BLACK HOLES NEUTRON STARS PULSARS RT RELATIVITY X RAY SOURCES RELATIVISTIC VELOCITY BT VELOCITY RT BIG BANG THEORY COSMOLOGY QUANTUM MECHANICS RELATIVITY RELATIVITY BT COSMOGONY NT GENERAL THEORY OF RELATIVITY RT FIELD EQUATIONS GRAVITATION INERTIAL COORDINATE SYSTEM INERTIAL REFERENCE FRAME RELATIVISTIC DISKS RELATIVISTIC EFFECTS RELATIVISTIC MECHANICS RELATIVISTIC PLASMAS RELATIVISTIC STARS RELATIVISTIC VELOCITY RELAXATION TIME RT AGE CLUSTERS OF GALAXIES STAR CLUSTERS STELLAR DYNAMICS REMOTE CONTROL SYSTEMS BT CONTROL SYSTEMS RT AUTOMATED TELESCOPES AUTOMATIC PATROL TELESCOPES TELESCOPE INSTRUMENTATION TELESCOPES REMOTE SENSING RT DETECTORS INFRARED RADIATION MICROWAVE RADIATION RESEARCH RT DESIGN DISCOVERIES OBSERVATIONS THEORY RESEAUX RT CALIBRATION GRIDS PHOTOGRAPHIC PLATES SPECTROSCOPY RESIDUAL INTENSITY RT ABSORPTION LINES LINE PROFILES RESOLUTION NT ANGULAR RESOLUTION SPECTRAL RESOLUTION RT INTERFEROMETRY OPTICS PIXEL RAYLEIGH CRITERION SENSITIVITY SIDELOBES VISUAL ACUITY RESONANCE GAPS NT KIRKWOOD GAPS RT MINOR PLANETS PLANETARY RINGS PLANETS SHEPHERD SATELLITES RESONANCE LINES Not a complete list of terms. NT H ALPHA LYMAN ALPHA RT SPECTRA RETARDATION Combine with other terms RETICLE RT EYEPIECES GRATICULE GRIDS RETICON ARRAYS BT MULTICHANNEL DETECTORS RT DIODE ARRAYS retinal adaption U DARK ADAPTION reversing layer U PHOTOSPHERE RGU PHOTOMETRY BT BROAD BAND PHOTOMETRY rho cas stars U RHO CASSIOPEIAE STARS RHO CASSIOPEIAE STARS UF rho cas stars RIGHT ASCENSION RT CELESTIAL EQUATOR DECLINATION EQUATOR EQUATORIAL COORDINATE SYSTEM HOUR ANGLE TRANSIT TIME RIGID BODY ROTATION BT ROTATION RT ROTATING BODIES RILLES RT PLANETS SATELLITES RING DIVISIONS RT PLANETARY RINGS PLANETS RING GALAXIES BT GALAXIES PECULIAR GALAXIES RT RINGS RING NEBULAE BT NEBULAE RT PLANETARY NEBULAE RINGS NT PLANETARY RINGS STELLAR RINGS RT ANSAE RING GALAXIES RITCHEY CHRETIEN TELESCOPES BT REFLECTING TELESCOPES robotic telescopes U AUTOMATED TELESCOPES ROCHE LIMIT RT CLOSE BINARY STARS GRAVITATION ORBITS PLANETARY RINGS PLANETS TIDAL DISRUPTION ROCHE LOBE RT CLOSE BINARY STARS ECLIPSING BINARY STARS INTERACTING BINARY STARS TIDAL INTERACTION ROCKET BORNE INSTRUMENTS RT AIRPLANE BORNE INSTRUMENTS BALLOON BORNE INSTRUMENTS COSMIC RAY ASTRONOMY GAMMA RAY ASTRONOMY GROUND BASED ASTRONOMY INFRARED OBSERVATORIES SATELLITE BORNE INSTRUMENTS SPACE PROBE INSTRUMENTS SPACE TELESCOPES ULTRAVIOLET ASTRONOMY X RAY ASTRONOMY ROSSELAND OPACITY BT OPACITY RT ABSORPTION KRAMERS OPACITY STELLAR INTERIORS ROTATING BODIES NT CIRCUMSTELLAR DISKS CIRCUMSTELLAR SHELLS ROTATING STARS RT RIGID BODY ROTATION ROTATION rotating shells U CIRCUMSTELLAR SHELLS ROTATING STARS BT ROTATING BODIES RT RADIATIVE BRAKING SYNCHRONOUS ROTATION VON ZEIPEL THEOREM ROTATION Combine with other terms NT DIFFERENTIAL ROTATION RIGID BODY ROTATION SYNCHRONOUS ROTATION RT ANGULAR MOMENTUM ANGULAR VELOCITY EQUATORIAL BULGE OBLATENESS PERIOD ROTATING BODIES RR LYRAE STARS UF ab variable stars cluster type variable stars BT DOUBLE MODE VARIABLE STARS POPULATION II CEPHEIDS PULSATING VARIABLE STARS NT BAILEY TYPES RRa STARS RRab STARS RRb STARS RRc STARS RT BL HERCULIS STARS BLAZHKO EFFECT CEPHEIDS GALACTIC HALO GLOBULAR STAR CLUSTERS HORIZONTAL BRANCH STARS OOSTERHOFF GROUPS W VIRGINIS STARS RR TELESCOPII STARS RRa STARS BT RR LYRAE STARS RRab STARS BT RR LYRAE STARS RRb STARS BT RR LYRAE STARS RRc STARS BT RR LYRAE STARS RS CANUM VENATICORUM STARS BT BINARY STARS MULTIPERIODIC VARIABLE STARS X RAY SOURCES RT STARSPOTS RUNAWAY STARS RT BINARY STARS HIGH VELOCITY STARS OB STARS SUPERNOVAS RV TAURI STARS BT EMISSION LINE STARS IRREGULAR VARIABLE STARS LATE TYPE SUPERGIANT STARS LONG PERIOD VARIABLE STARS PULSATING VARIABLE STARS SEMIREGULAR VARIABLE STARS RT RADIAL PULSATIONS S VULPECULAE STARS RW AURIGAE STARS BT CATACLYSMIC VARIABLE STARS EMISSION LINE STARS IRREGULAR VARIABLE STARS PREMAINSEQUENCE STARS ULTRAVIOLET EXCESS STARS RT H ALPHA EMISSION LINE STARS T ASSOCIATIONS T TAURI STARS S DORADUS STARS UF p cygni stars BT EARLY TYPE VARIABLE STARS EMISSION LINE STARS SHELL STARS RT P CYGNI LINE PROFILES s PROCESS RT NUCLEOSYNTHESIS p PROCESS r PROCESS SUPERNOVAS S STARS UF se stars BT GIANT STARS LATE TYPE STARS RT BARIUM STARS CARBON STARS HEAVY METAL STARS SPECTRAL TYPES TECHNETIUM STARS ZIRCONIUM STARS S VULPECULAE STARS BT LONG PERIOD VARIABLE STARS PULSATING VARIABLE STARS SEMIREGULAR VARIABLE STARS RT MIRA VARIABLE STARS RV TAURI STARS S0 galaxies U LENTICULAR GALAXIES SAHA EQUATION RT IONS THERMAL EQUILIBRIUM SAMPLING Combine with other terms SAROS CYCLE RT LUNAR ECLIPSE METONIC CYCLE PHASE [MOON] SATELLITE BORNE INSTRUMENTS RT AIRPLANE BORNE INSTRUMENTS BALLOON BORNE INSTRUMENTS COSMIC RAY ASTRONOMY GAMMA RAY ASTRONOMY GROUND BASED ASTRONOMY INFRARED ASTRONOMY MILLIMETER ASTRONOMY ROCKET BORNE INSTRUMENTS SPACE PROBE INSTRUMENTS SPACE TELESCOPES ULTRAVIOLET ASTRONOMY X RAY ASTRONOMY SATELLITE LASER RANGING BT LASER RANGING RT ARTIFICIAL SATELLITES LASERS LUNAR LASER RANGING OPTICAL RADAR SATELLITES Natural satellites. NT GALILEAN SATELLITES MOON PLANET SATELLITES RT PLANETESIMALS PLANETS PROTOPLANETS RILLES SOLAR SYSTEM SURFACES [CELESTIAL BODIES] TOPOGRAPHY VOLCANOES satellites Artificial satellites of Earth. U ARTIFICIAL SATELLITES SCALE HEIGHT RT ATMOSPHERES ATMOSPHERIC DENSITY EARTH ATMOSPHERE STELLAR ATMOSPHERES SCATTERING NT ATMOSPHERIC EXTINCTION COMPTON SCATTERING ELEMENTARY PARTICLE SCATTERING GAMMA RAY SCATTERING LIGHT SCATTERING MIE SCATTERING RT RADIATION SCATTERING REFLECTION REFRACTION SCHMIDT CAMERAS BT CAMERAS PHOTOGRAPHIC INSTRUMENTS RT CORRECTOR PLATES SCHMIDT TELESCOPES SCHMIDT TELESCOPES BT CATADIOPTRIC SYSTEMS PHOTOGRAPHIC INSTRUMENTS REFLECTING TELESCOPES RT BAKER NUNN CAMERAS CORRECTOR PLATES MAKSUTOV TELESCOPES OBJECTIVE PRISMS SCHMIDT CAMERAS WIDE FIELD TELESCOPES schonberg chandrasekhar limit U CHANDRASEKHAR SCHONBERG LIMIT SCHWARZSCHILD METRIC RT GENERAL THEORY OF RELATIVITY GRAVITATIONAL FIELDS IONIZATION ORBITS SPACETIME SINGULARITY SCHWARZSCHILD RADIUS Limiting radius of black hole RT BLACK HOLES GENERAL THEORY OF RELATIVITY SCINTILLATION NT ATMOSPHERIC SCINTILLATION INTERPLANETARY SCINTILLATION INTERSTELLAR SCINTILLATION IONOSPHERIC SCINTILLATION PHOSPHORESCENT SCINTILLATION RT ATMOSPHERES ATMOSPHERIC REFRACTION EARTH EARTH ATMOSPHERE SPECKLES TURBULENCE [EARTH ATMOSPHERE] SCINTILLATION COUNTERS BT COUNTERS NT CERENKOV COUNTERS RT IMAGE TUBES PHOSPHORESCENCE PHOSPHORESCENT SCINTILLATION PHOTOMULTIPLIER TUBES se stars U S STARS SEASONAL PHENOMENA Combine with other terms SEASONS Combine with other terms SECONDARY COSMIC RAYS RT COSMIC RAY SHOWERS COSMIC RAYS SECONDARY MIRRORS BT TELESCOPE MIRRORS RT CASSEGRAIN ANTENNAS CASSEGRAIN FOCUS OPTICAL TELESCOPES PRIMARY MIRRORS REFLECTING TELESCOPES SUBREFLECTORS SECULAR PARALLAX BT PARALLAXES RT MOVING CLUSTER PARALLAX PROPER MOTIONS STAR ASSOCIATIONS SEEING NT DOME SEEING RT ACTIVE OPTICS ADAPTIVE OPTICS ATMOSPHERIC REFRACTION ATMOSPHERIC SCINTILLATION EARTH ATMOSPHERE POINT SPREAD FUNCTION SEEING MONITORS SITE TESTING SPECKLE INTERFEROMETRY SPECKLES TIP TILT MIRRORS TURBULENCE [EARTH ATMOSPHERE] SEEING MONITORS BT OPTICAL INSTRUMENTS RT OPTICAL OBSERVATORIES SEEING SITE TESTING SEGMENTED OPTICS RT ADAPTIVE OPTICS MULTIPLE MIRROR TELESCOPES TIP TILT MIRRORS VERY LARGE TELESCOPES SEISMOLOGY NT ASTEROSEISMOLOGY HELIOSEISMOLOGY RT EARTH STELLAR OSCILLATIONS VIBRATION SELECTION EFFECTS Combine with other terms BT ERRORS RT CORRECTIONS STATISTICS SELECTIVE ABSORPTION RT GAS TO DUST RATIO INTERSTELLAR MATTER INTERSTELLAR REDDENING REDDENING REDDENING LAW SELENOLOGY RT MOON SELF ABSORPTION RT SPECTRA SELF CALIBRATION METHODS BT CALIBRATION SEMIBARIUM STARS BT BARIUM STARS SEMICONDUCTOR DEVICES NT CHARGE COUPLED DEVICES CHARGE INJECTION DEVICES CHARGE TRANSFER DEVICES PHOTOVOLTAIC CELLS RT DETECTORS GUNN DIODES SEMIDETACHED BINARY STARS BT BINARY STARS CLOSE BINARY STARS RT DETACHED BINARY STARS SEMIMAJOR AXIS BT ORBITAL ELEMENTS RT BINARY STARS PLANETS SEMIREGULAR VARIABLE STARS BT LATE TYPE GIANT STARS PULSATING VARIABLE STARS VARIABLE STARS NT RV TAURI STARS S VULPECULAE STARS RT IRREGULAR VARIABLE STARS MIRA VARIABLE STARS SUPERGIANT STARS SENSITIVITY RT DETECTORS INTEGRATION TIME LIMITING MAGNITUDES POLAR DIAGRAM PRECISION RESOLUTION SIGNAL DETECTION SIGNAL TO NOISE RATIO SENSITOMETERS BT MEASURING INSTRUMENTS SEPARATION Combine with other terms RT BINARY STARS OCCULTING DISK VISUAL BINARY STARS seti U EXTRATERRESTRIAL LIFE SEXTANTS BT ASTROMETRIC INSTRUMENTS INSTRUMENTATION RT ALTITUDE [ANGLE] SEYFERT GALAXIES BT PECULIAR GALAXIES RT BL LACERTAE OBJECTS COMPACT NUCLEI EMISSION LINE GALAXIES MARKARIAN GALAXIES MASSIVE OBJECTS SEYFERT NUCLEI X RAY SOURCES SEYFERT NUCLEI BT ACTIVE GALACTIC NUCLEI COMPACT NUCLEI EMISSION LINE GALAXIES RT SEYFERT GALAXIES SHADOW BANDS RT DIFFRACTION INTERFERENCE [WAVES] SOLAR ECLIPSE SHAPED REFLECTORS RT RADIO TELESCOPES SHELL BURNING Nuclear fusion in shell RT CARBON BURNING HELIUM BURNING HYDROGEN BURNING NUCLEAR FUSION SHELL STARS BT EMISSION LINE STARS NT GAMMA CASSIOPEIAE STARS S DORADUS STARS Z ANDROMEDAE STARS RT CIRCUMSTELLAR SHELLS P CYGNI LINE PROFILES SHELLS SHELLS NT CIRCUMSTELLAR SHELLS CONVECTIVE SHELLS DUST SHELLS RT SHELL STARS SHEPHERD SATELLITES RT PLANETARY RINGS RESONANCE GAPS SHOCK WAVES NT BOW SHOCKS IONIZING SHOCK WAVES RT JUMP CONDITIONS RANKINE HUGONIOT RELATIONS SPEED OF SOUND SUPERNOVA ENVELOPES VELOCITY FIELD WAVE PROPAGATION SHOCKS Combine with other terms RT COLLISIONAL PLASMAS IONIZATION STELLAR WINDS SUPERNOVAS SHORT PERIOD VARIABLE STARS NT BETA CEPHEI STARS DELTA SCUTI STARS SHOT NOISE BT NOISE RT DETECTORS ELECTRONIC EQUIPMENT SIDELOBES UF lobes [telescope beams] RT POLAR DIAGRAM RADIO ANTENNAS RESOLUTION SIDEREAL TIME BT TIME RT EARTH EQUATION OF THE EQUINOXES HOUR ANGLE TRANSIT TIME YEAR SIDEROSTATS RT ALTAZIMUTH MOUNTING COELOSTATS DRIVES HELIOSTATS TELESCOPE MOUNTINGS SIGNAL ANALYSIS BT ANALYSES RT SIGNAL DETECTION SIGNAL PROCESSING SIGNAL DETECTION BT DETECTION RT DETECTORS LIMITING MAGNITUDES SENSITIVITY SIGNAL ANALYSIS SIGNAL PROCESSING SIGNAL PROCESSING BT ANALYSES RT SIGNAL ANALYSIS SIGNAL DETECTION SIGNAL TO NOISE RATIO RT BACKGROUND NOISE INTEGRATION TIME LIMITING MAGNITUDES NOISE SENSITIVITY SKY NOISE SILICON BURNING BT NUCLEAR FUSION NUCLEOSYNTHESIS RT CARBON BURNING HELIUM BURNING HYDROGEN BURNING SILICON STARS BT Ap STARS METAL RICH STARS SILVER COATINGS BT COATINGS THIN FILMS RT ALUMINUM COATINGS SURFACES [OPTICAL] SIMULATION NT COMPUTER SIMULATIONS RT MODELS SINGULARITY NT NAKED SINGULARITY SPACETIME SINGULARITY SiO MASERS BT MASERS RT INTERSTELLAR MATTER OH MASERS RADIO SOURCES WATER MASERS SITE PROTECTION RT AIR POLLUTION LIGHT POLLUTION OBSERVATORIES SITE TESTING RT OBSERVATORIES POLLUTION SEEING SEEING MONITORS SKY BRIGHTNESS SKY Combine with other terms SKY BRIGHTNESS NT NIGHT SKY BRIGHTNESS RT AIRGLOW ATMOSPHERIC RADIATION AURORAS BACKGROUND RADIATION MILKY WAY GALAXY SITE TESTING SUNLIGHT TWILIGHT ZODIACAL LIGHT SKY NOISE BT NOISE RT BACKGROUND NOISE SIGNAL TO NOISE RATIO sky radiation U ATMOSPHERIC RADIATION SKY SURVEYS BT SURVEYS RT ATLASES CATALOGS FINDING CHARTS MAPS SLOW NOVAS BT NOVAS NT DQ HERCULIS STARS NOVOIDS RT FAST NOVAS RECURRENT NOVAS SMALL MAGELLANIC CLOUD BT MAGELLANIC CLOUDS RT LARGE MAGELLANIC CLOUD SOLAR See under SUN SOLAR ACTIVITY NT SOLAR STORMS RT ACTIVE SUN ACTIVITY INDEXES AURORAS BUTTERFLY DIAGRAM CORONAL LOOPS EPHEMERAL ACTIVE REGIONS FLARES HELIOSPHERE MAGNETIC STORMS MAUNDER MINIMUM PROMINENCES SOLAR ATMOSPHERE SOLAR CYCLE SOLAR WIND SUNSPOT CYCLE SUNSPOT GROUPS SUNSPOT NUMBERS SUNSPOTS SOLAR ATMOSPHERE BT STELLAR ATMOSPHERES RT CHROMOSPHERE HELIOPAUSE HELIOSPHERE LIMB DARKENING LINE FORMATION SOLAR ACTIVITY SOLAR CORONA SOLAR PHYSICS SOLAR STORMS SOLAR SURFACE SOLAR TERRESTRIAL RELATIONS SOLAR WIND SOLAR CONSTANT RT RADIATION SOLAR PHYSICS SUN SUNLIGHT SOLAR CORONA BT CORONAS NT M REGIONS RT CORONAGRAPHS CORONAL HOLES CORONAL LINES CORONAL LOOPS CORONAL MASS EJECTIONS CORONAL PLUMES CORONAL TRANSIENTS K CORONA SOLAR ATMOSPHERE SUN TRANSITION REGION SOLAR CYCLE RT ACTIVE SUN BUTTERFLY DIAGRAM QUIET SUN SOLAR ACTIVITY SOLAR PHYSICS SUNSPOT CYCLE SUNSPOT NUMBERS SOLAR DAY RT EPHEMERIS TIME UNIVERSAL TIME SOLAR ECLIPSE BT ECLIPSES RT BAILYS BEADS DIAMOND RING EFFECT FLASH SPECTRUM MOON PENUMBRA SHADOW BANDS SUN UMBRA ZONE OF TOTALITY SOLAR INTERIOR BT STELLAR INTERIORS RT SOLAR NEUTRINO PROBLEM SOLAR PHYSICS STELLAR EVOLUTION STELLAR STRUCTURE SOLAR MOTION With respect to nearby stars. BT MOTION RT ANTAPEX APEX SOLAR NEBULA RT PLANETS PROTOPLANETARY NEBULAS PROTOPLANETS SOLAR SYSTEM SOLAR NEUTRINO PROBLEM RT NEUTRINOS NUCLEAR REACTIONS SOLAR INTERIOR SOLAR OBSERVATORIES RT CORONAGRAPHS SOLAR OPTICAL TELESCOPES SOLAR RADIO TELESCOPES SOLAR TELESCOPES SOLAR OPTICAL TELESCOPES BT SOLAR TELESCOPES RT SOLAR OBSERVATORIES SOLAR RADIO TELESCOPES SOLAR OSCILLATIONS UF five minute oscillations BT STELLAR OSCILLATIONS RT ASTEROSEISMOLOGY HELIOSEISMOLOGY SOLAR PARALLAX RT ASTRONOMICAL UNIT EARTH ORBIT SOLAR PHYSICS RT FORBUSH EFFECT SOLAR ATMOSPHERE SOLAR CONSTANT SOLAR CYCLE SOLAR INTERIOR SOLAR TELESCOPES SOLAR TERRESTRIAL RELATIONS SUN solar plages U PLAGES SOLAR PLANETARY RELATIONS NT SOLAR TERRESTRIAL RELATIONS RT PLANETS SOLAR SYSTEM SUN SOLAR RADIO TELESCOPES BT SOLAR TELESCOPES RT SOLAR OBSERVATORIES SOLAR OPTICAL TELESCOPES solar seismology U HELIOSEISMOLOGY SOLAR STORMS BT SOLAR ACTIVITY RT SOLAR ATMOSPHERE SOLAR SURFACE RT PHOTOSPHERE SOLAR ATMOSPHERE SUN SUPERGRANULATION SOLAR SYSTEM Not a complete list of terms. BT PLANETARY SYSTEMS RT ALIGNMENT [PLANETS] BODES LAW COMETS EARTH EARTH MOON SYSTEM EXTRASOLAR PLANETS KREUTZ SUNGRAZERS MINOR PLANETS ORIGIN PLANETARY THEORY PLANETESIMALS PLANETS PRESOLAR NEBULA PROTOPLANETS SATELLITES SOLAR NEBULA SOLAR PLANETARY RELATIONS SUN SYNODIC PERIOD TRANSPLUTONIAN PLANETS SOLAR TELESCOPES UF tower telescope BT TELESCOPES NT RADIOHELIOGRAPHS SOLAR OPTICAL TELESCOPES SOLAR RADIO TELESCOPES RT HELIOSTATS SOLAR OBSERVATORIES SOLAR PHYSICS SOLAR TERRESTRIAL RELATIONS BT SOLAR PLANETARY RELATIONS RT EARTH SOLAR ATMOSPHERE SOLAR PHYSICS SUN SOLAR WIND BT INTERPLANETARY MATTER PLASMAS STELLAR WINDS RT CORONAL HOLES HELIOPAUSE HELIOSPHERE INTERPLANETARY GAS INTERSTELLAR WINDS POYNTING ROBERTSON EFFECT RADIATION PRESSURE SOLAR ACTIVITY SOLAR ATMOSPHERE SOLSTICES NT SUMMER SOLSTICE WINTER SOLSTICE RT ECLIPTIC EQUINOXES TROPIC OF CANCER TROPIC OF CAPRICORN sound U ACOUSTIC WAVES sound waves U ACOUSTIC WAVES SOUTH CELESTIAL POLE BT CELESTIAL POLES RT NORTH CELESTIAL POLE SOUTH GALACTIC POLE BT GALACTIC POLES RT NORTH GALACTIC POLE SOUTHERN HEMISPHERE RT NORTHERN HEMISPHERE SPACE RT GENERAL THEORY OF RELATIVITY SPECIAL THEORY OF RELATIVITY VACUUM SPACE ASTROMETRY BT ASTROMETRY RT ORBITING OBSERVATORIES SPACE GEODESY SPACE OBSERVATORIES SPACE ASTRONOMY NT GAMMA RAY ASTRONOMY ORBITING OBSERVATORIES ULTRAVIOLET ASTRONOMY X RAY ASTRONOMY RT ARTIFICIAL SATELLITES SPACE EXPLORATION SPACE PROBES SPACE BIOLOGY UF cosmobiology BT SPACE RESEARCH RT SPACE OBSERVATORIES SPACE VEHICLES SPACE DEBRIS UF debris BT SPACE VEHICLES RT SPACE LAW SPACE POLLUTION SPACE EXPLORATION RT DISCOVERIES INTERSTELLAR COMMUNICATION PLANETS SPACE ASTRONOMY SPACE OBSERVATORIES SPACE PROBES SPACE RESEARCH SPACE TELESCOPES SPACE VEHICLES SPACE GEODESY BT GEODESY NT ORBITING OBSERVATORIES RT EARTH SPACE ASTROMETRY SPACE OBSERVATORIES SPACE LAW RT SPACE DEBRIS SPACE RESEARCH SPACE MOTION BT MOTION NT PROPER MOTIONS RADIAL VELOCITY RT GALACTIC ROTATION STELLAR MOTIONS TRANSVERSE VELOCITY SPACE OBSERVATORIES Named observatories not included. BT OBSERVATORIES NT GAMMA RAY OBSERVATORIES ORBITING OBSERVATORIES X RAY OBSERVATORIES RT INFRARED OBSERVATORIES SPACE ASTROMETRY SPACE BIOLOGY SPACE EXPLORATION SPACE GEODESY SPACE PROBES SPACE RESEARCH SPACE TELESCOPES ULTRAVIOLET ASTRONOMY X RAY ASTRONOMY SPACE POLLUTION BT POLLUTION RT SPACE DEBRIS SPACE PROBE INSTRUMENTS NT SPACE TELESCOPES RT BALLOON BORNE INSTRUMENTS GROUND BASED ASTRONOMY ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE PROBES SPACE PROBES UF probes RT SPACE ASTRONOMY SPACE EXPLORATION SPACE OBSERVATORIES SPACE PROBE INSTRUMENTS SPACE VEHICLES SPACE RESEARCH UF space science BT ASTRONOMICAL RESEARCH NT SPACE BIOLOGY RT SPACE EXPLORATION SPACE LAW SPACE OBSERVATORIES space science U SPACE RESEARCH SPACE TELESCOPES Named telescopes not included. BT SPACE PROBE INSTRUMENTS TELESCOPES NT GAMMA RAY TELESCOPES ULTRAVIOLET TELESCOPES X RAY TELESCOPES RT ARTIFICIAL SATELLITES BALLOON BORNE INSTRUMENTS GROUND BASED ASTRONOMY ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE EXPLORATION SPACE OBSERVATORIES SPACE VEHICLES Named vehicles not included. NT SPACE DEBRIS RT ARTIFICIAL SATELLITES SPACE BIOLOGY SPACE EXPLORATION SPACE PROBES SPACETIME SINGULARITY BT SINGULARITY RT BLACK HOLES NAKED SINGULARITY QUANTUM COSMOLOGY SCHWARZSCHILD METRIC SPECIAL THEORY OF RELATIVITY BT GENERAL THEORY OF RELATIVITY RT SPACE specific gravity U DENSITY specific intensity U INTENSITY SPECKLE INTERFEROMETRY BT INTERFEROMETRY RT ANGULAR DIAMETERS ANGULAR RESOLUTION ANGULAR SEPARATION SEEING SPECKLES SPECKLES RT ATMOSPHERIC REFRACTION SCINTILLATION SEEING SPECKLE INTERFEROMETRY SPECTRA Not a complete list of terms. UF spectrum NT ABSORPTION SPECTRA ATOMIC SPECTRA BRILLOUIN SPECTRA CONTINUOUS SPECTRA ECHELLE SPECTRA EMISSION SPECTRA HYDROGEN SPECTRUM MICROWAVE SPECTRA MOLECULAR SPECTRA RADIO SPECTRA TWO DIMENSIONAL SPECTRA VIBRATIONAL SPECTRA VISIBLE SPECTRUM RT ABSORPTION LINES BREMSSTRAHLUNG CONTINUA DIFFRACTION GRATINGS EMISSION LINES ENERGY LEVELS EQUIVALENT WIDTHS FLUORESCENCE FORBIDDEN LINES FORBIDDEN TRANSITIONS FREE BOUND EMISSION FREE FREE EMISSION HERTZSPRUNG RUSSELL DIAGRAM HYPERFINE LINES MK CLASSIFICATION PRISMS RECOMBINATION LINES RESONANCE LINES SELF ABSORPTION SPECTROSCOPIC ANALYSIS SPECTROSCOPY STIMULATED EMISSION spectral analysis U SPECTROSCOPIC ANALYSIS SPECTRAL BANDS NT MOLECULAR BANDS RT MOLECULAR LINES MOLECULAR SPECTRA TELLURIC LINES SPECTRAL CLASSIFICATION BT CLASSIFICATION NT HENRY DRAPER SYSTEM MK CLASSIFICATION RT HENRY DRAPER CATALOG LUMINOSITY CLASSIFICATION SPECTRAL TYPES SPECTRAL INDICES RT RADIO FREQUENCIES RADIO SPECTRA spectral line broadening U LINE BROADENING spectral line formation U LINE FORMATION spectral line shift U LINE SHIFT spectral line splitting U ZEEMAN SPLITTING spectral line widths U LINE WIDTHS SPECTRAL LINES Not a complete list of terms. UF spectrum lines NT ABSORPTION LINES CALCIUM LINES CARBON LINES EMISSION LINES METAL LINES MOLECULAR LINES TECHNETIUM LINES TELLURIC LINES ULTRAVIOLET LINES RT EQUIVALENT WIDTHS FINE STRUCTURE INSTRUMENTAL PROFILES LINE BLANKETING LINE BLENDING LINE BROADENING LINE FORMATION LINE IDENTIFICATIONS LINE INTENSITITES LINE PROFILES LINE RATIOS NATURAL LINE BROADENING NATURAL LINE WIDTH SPECTRAL TYPES TRANSITION PROBABILITIES SPECTRAL RESOLUTION BT RESOLUTION RT LINE BLENDING SPECTRAL TYPES Not a complete list of terms. RT A STARS B STARS F STARS G STARS K STARS LINE WIDTHS LUMINOSITY CLASS LUMINOSITY CLASSIFICATION M STARS N STARS O STARS R STARS S STARS SPECTRAL CLASSIFICATION SPECTRAL LINES STANDARD STARS TEMPERATURE SPECTROGRAPHS UF optical spectrometers BT OPTICAL INSTRUMENTS TELESCOPE INSTRUMENTATION NT COUDE SPECTROGRAPHS ECHELLE SPECTROGRAPHS GAMMA RAY SPECTROGRAPHS GRATING SPECTROGRAPHS PRISM SPECTROGRAPHS RADIO SPECTROGRAPHS ULTRAVIOLET SPECTROGRAPHS X RAY SPECTROGRAPHS RT DIFFRACTION GRATINGS ECHELLE GRATINGS GRISMS PRISMS SPECTROHELIOGRAPHS SPECTROGRAPHY See SPECTROSCOPY. UF spectrophotography RT PHOTOGRAPHY SPECTROHELIOGRAPHS RT CORONAGRAPHS PHOTOHELIOGRAPHS SPECTROGRAPHS SPECTROMETERS Also see under SPECTROGRAPHS UF optical spectrometers BT INSTRUMENTATION NT FABRY PEROT SPECTROMETERS FOURIER SPECTROMETERS MULTICHANNEL SPECTROMETERS RADIO SPECTROMETERS X RAY SPECTROMETERS RT SPECTROMETRY SPECTROMETRY BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES RT RADIAL VELOCITY SPECTROMETERS spectrophotography U SPECTROGRAPHY SPECTROSCOPY SPECTROPHOTOMETERS BT PHOTOMETERS RT SPECTROPHOTOMETRY TELESCOPE INSTRUMENTATION SPECTROPHOTOMETRY BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES RT COLOR OPTICAL SCANNERS PHOTOMETRY SPECTROPHOTOMETERS SPECTROSCOPY STANDARD CANDLES SPECTROSCOPIC ANALYSIS UF spectral analysis RT ABSORPTION LINES COLLISION BROADENING CONTINUOUS SPECTRA DOPPLER EFFECT EMISSION LINES MAXIMUM ENTROPY METHODS MILNE EDDINGTON APPROXIMATION SPECTRA WAVE MOTION WAVEFORM ANALYSIS SPECTROSCOPIC BINARY STARS UF spectrum binary stars BT BINARY STARS NT TWO SPECTRUM BINARY STARS RT DOPPLER EFFECT ECLIPSING BINARY STARS ELLIPSOIDAL VARIABLE STARS MASS MASS FUNCTION VELOCITY CURVES SPECTROSCOPY Not a complete list of terms. UF spectrophotography BT ASTRONOMICAL TECHNIQUES OBSERVING TECHNIQUES NT ABSORPTION SPECTROSCOPY COLLISION SPECTROSCOPY FOURIER TRANSFORM SPECTROSCOPY GAMMA RAY SPECTROSCOPY HIGH RESOLUTION SPECTROSOPY INTERFERENCE SPECTROSOCOPY MICROWAVE SPECTROSCOPY OPTICAL SPECTROSCOPY RAMAN SPECTROSCOPY TIME RESOLVED SPECTROSCOPY TWO DIMENSIONAL SPECTROSCOPY X RAY SPECTROSCOPY RT COLLISIONAL EXCITATION CONTINUOUS SPECTRA HETERODYNE PRESSURE BROADENING RESEAUX SPECTRA SPECTROPHOTOMETRY spectrum U SPECTRA spectrum binary stars U SPECTROSCOPIC BINARY STARS TWO SPECTRUM BINARY STARS spectrum lines U SPECTRAL LINES SPECTRUM VARIABLE STARS BT Am STARS Ap STARS INTRINSIC VARIABLE STARS NT MANGANESE STARS RT ALPHA2 CANUM VENATICORUM STARS MAGNETIC STARS OBLIQUE ROTATORS speed of light U VELOCITY OF LIGHT SPEED OF SOUND RT ACOUSTIC WAVES SHOCK WAVES SPHERICAL ABERRATION BT ABERRATIONS RT ASTIGMATISM CHROMATIC ABERRATION COMA DISTORTION FIELD CURVATURE spherical albedo U ALBEDO SPHERICAL COORDINATES UF angular coordinates RT COORDINATE SYSTEMS POSITIONS REFERENCE SYSTEMS SPICULES NT MACRO SPICULES RT CHROMOSPHERE SUN SPIRAL ARMS UF arms RT GALACTIC STRUCTURE GAS DISTRIBUTION INTERSTELLAR MAGNETIC FIELDS INTERSTELLAR MATTER OPEN STAR CLUSTERS PITCH ANGLE POPULATION I STARS SPIRAL GALAXIES SPIRAL GALAXIES BT GALAXIES NT BARRED SPIRAL GALAXIES MILKY WAY GALAXY RT LATE TYPE GALAXIES PITCH ANGLE SPIRAL ARMS SS CYGNI STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS U GEMINORUM STARS RT SU URSAE MAJORIS STARS Z CAMELOPARDALIS STARS STABILITY Combine with other terms RT VIBRATION STANDARD CANDLES RT EFFECTIVE TEMPERATURE PHOTOMETRIC STANDARD STARS PHOTOMETRY SPECTROPHOTOMETRY STANDARD EPOCH NT BESSELIAN EPOCH JULIAN EPOCH STANDARD STARS NT PHOTOMETRIC STANDARD STARS RT COMPARISON STARS POSITIONS SPECTRAL TYPES STAR ASSOCIATIONS NT O ASSOCIATIONS OB ASSOCIATIONS R ASSOCIATIONS T ASSOCIATIONS RT GOULDS BELT OPEN STAR CLUSTERS SECULAR PARALLAX STAR ATLASES BT ATLASES RT FINDING CHARTS MAPS STAR CLUSTERS UF clusters of stars BT CLUSTERS NT GLOBULAR STAR CLUSTERS OPEN STAR CLUSTERS RT CLUSTER ROTATION CLUSTERING INITIAL MASS FUNCTION INTEGRATED MAGNITUDE LUMINOSITY FUNCTION MASS FUNCTION POINCARE THEOREM PROTOCLUSTERS RELAXATION TIME TIDAL DISRUPTION TIDAL RADIUS VELOCITY DISPERSION VELOCITY DISTRIBUTION VIRIAL THEOREM STAR COUNTS RT GALACTIC STRUCTURE MASS FUNCTION STAR DISTRIBUTION STATISTICS STAR DISTRIBUTION RT STAR COUNTS SURVEYS STAR FORMATION UF formation of stars star origin RT BIRTH RATES BOK GLOBULES COOLING FLOWS DARK NEBULAE EXTRASOLAR PLANETS INFRARED SOURCES JEANS LENGTH PREMAINSEQUENCE STARS PROTOSTARS STARBURST GALAXIES STELLAR EVOLUTION STELLAR RINGS star origin U STAR FORMATION STELLAR EVOLUTION STARBURST GALAXIES BT GALAXIES RT STAR FORMATION STELLAR EVOLUTION STARK BROADENING BT LINE BROADENING RT DOPPLER BROADENING NATURAL LINE WIDTH ZEEMAN SPLITTING STARS Combine STAR or STELLAR with other terms. NT SUN STARSPOTS RT BY DRACONIS STARS RS CANUM VENATICORUM STARS SUNSPOTS STATISTICAL PARALLAX BT PARALLAXES STATISTICS Combine with other terms RT DISTRIBUTION FUNCTION MONTE CARLO TECHNIQUES RADIO SOURCE COUNTS SELECTION EFFECTS STAR COUNTS STEADY STATE THEORY BT COSMOLOGY RT BIG BANG THEORY CLOSED UNIVERSE OPEN UNIVERSE STELLAR See SN for STARS. stellar abundance U ABUNDANCE STELLAR ATMOSPHERES BT ATMOSPHERES NT SOLAR ATMOSPHERE RT CHROMOSPHERE CORONAS DREDGE UP LIMB BRIGHTENING LIMB DARKENING LINE BROADENING LINE FORMATION LINE WIDTHS NEGATIVE H ION SCALE HEIGHT STELLAR STRUCTURE STELLAR WINDS TURBULENCE [STAR ATMOSPHERE] STELLAR DYNAMICS RT CLOSE ENCOUNTERS ENCOUNTERS FOKKER PLANCK EQUATION GALACTIC ROTATION N BODY PROBLEM POINCARE THEOREM PROPER MOTIONS RADIAL VELOCITY RELAXATION TIME STELLAR MOTIONS THREE BODY PROBLEM TWO BODY PROBLEM stellar envelopes U CIRCUMSTELLAR ENVELOPES CIRCUMSTELLAR MATTER CIRCUMSTELLAR SHELLS STELLAR EVOLUTION UF star origin BT EVOLUTION RT BIRTH RATES CARBON BURNING CHEMICAL EVOLUTION COLLAPSED STARS COSMOLOGY e PROCESS EVOLUTIONARY TRACKS FUNNELING GIANT STARS GRAVITATIONAL EQUILIBRIUM HELIUM BURNING HENYEY TRACK HERTZSPRUNG RUSSELL DIAGRAM HYDROGEN BURNING INITIAL MASS FUNCTION INNER CORE INSTABILITY STRIP KERR BLACK HOLE LUMINOSITY FUNCTION MASS LOSS PROTOSTARS SOLAR INTERIOR STAR FORMATION STARBURST GALAXIES STELLAR INTERIORS stellar interferometers U OPTICAL INTERFEROMETERS stellar interferometry U OPTICAL INTERFEROMETRY STELLAR INTERIORS NT SOLAR INTERIOR RT CARBON BURNING CARBON NITROGEN CYCLE CHANDRASEKHAR SCHONBERG LIMIT CORES DREDGE UP EDDINGTON LIMIT GRAVITY WAVES HELIUM BURNING HYDROGEN BURNING INNER CORE NUCLEAR FUSION NUCLEOSYNTHESIS OXYGEN BURNING PROTON PROTON REACTION ROSSELAND OPACITY STELLAR EVOLUTION STELLAR STRUCTURE TEMPERATURE ZONES STELLAR MOTIONS BT MOTION RT ASTROMETRY DOPPLER EFFECT LOCAL STANDARD OF REST PECULIAR MOTIONS PECULIAR VELOCITY PROPER MOTIONS RADIAL VELOCITY SPACE MOTION STELLAR DYNAMICS STELLAR OSCILLATIONS NT SOLAR OSCILLATIONS RT ASTEROSEISMOLOGY SEISMOLOGY STELLAR POPULATIONS RT DISK POPULATION HALO STARS INTERMEDIATE POPULATION STARS POPULATION I STARS POPULATION II STARS STELLAR RINGS BT RINGS RT STAR FORMATION stellar seismology U ASTEROSEISMOLOGY STELLAR STRUCTURE RT HYDROSTATIC EQUILIBRIUM MACROTURBULENCE MODELS POLYTROPES SOLAR INTERIOR STELLAR ATMOSPHERES STELLAR INTERIORS STELLAR WINDS BT PLASMAS NT SOLAR WIND RT ACCRETION DISKS CHROMOSPHERE CIRCUMSTELLAR SHELLS INTERSTELLAR WINDS MASS LOSS POYNTING ROBERTSON EFFECT RADIATION PRESSURE SHOCKS STELLAR ATMOSPHERES STIMULATED EMISSION RT LASERS MASERS POPULATION INVERSION SPECTRA STIMULATED RADIATION STIMULATED RADIATION RT STIMULATED EMISSION STOKES PARAMETERS RT POLARIZATION [WAVES] POLARIZED RADIATION STRATOPAUSE RT EARTH ATMOSPHERE MESOSPHERE STRATOSPHERE STRATOSPHERE RT EARTH ATMOSPHERE STRATOPAUSE TROPOPAUSE STREAK PHOTOGRAPHY BT PHOTOGRAPHY STREAMERS RT COMETS TAILS strings U COSMIC STRINGS STROBOSCOPES BT INSTRUMENTATION STROMGREN PHOTOMETRY UF four color photometry uvby system BT MEDIUM BAND PHOTOMETRY PHOTOMETRIC SYSTEMS RT E REGIONS F REGIONS H BETA PHOTOMETRY KAPTEYN SELECTED AREAS STROMGREN SPHERE BT GASEOUS SPHERES RT INTERSTELLAR MATTER IONIZATION IONIZED GASES STRONG INTERACTIONS Between atomic particles BT INTERACTIONS RT NUCLEAR PHYSICS WEAK INTERACTIONS STRONTIUM STARS RT MAGNETIC STARS STRUCTURE Combine with other terms RT PLANETS SU URSAE MAJORIS STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS U GEMINORUM STARS RT SS CYGNI STARS UX URSAE MAJORIS STARS WZ SAGITTAE STARS Z CAMELOPARDALIS STARS SUBDWARF STARS BT SUBLUMINOUS STARS NT A SUBDWARF STARS B SUBDWARF STARS F SUBDWARF STARS G SUBDWARF STARS K SUBDWARF STARS M SUBDWARF STARS O SUBDWARF STARS RT DWARF STARS HARMAN SEATON SEQUENCE SUBGIANT STARS BT POSTMAINSEQUENCE STARS NT A SUBGIANT STARS F SUBGIANT STARS G SUBGIANT STARS K SUBGIANT STARS M SUBGIANT STARS RT LUMINOSITY CLASSIFICATION SUBLUMINOUS STARS NT DEGENERATE STARS SUBDWARF STARS RT POPULATION II STARS SUBMILLIMETER ASTRONOMY BT RADIO ASTRONOMY RT MILLIMETER ASTRONOMY RADIO OBSERVATORIES SUBMILLIMETER WAVES SUBMILLIMETER WAVES RT SUBMILLIMETER ASTRONOMY SUBREFLECTORS RT CASSEGRAIN ANTENNAS CASSEGRAIN FOCUS RADIO TELESCOPES SECONDARY MIRRORS SUMMER SOLSTICE BT SOLSTICES RT TROPIC OF CANCER WINTER SOLSTICE SUN Combine SUN or SOLAR with other terms. Not a complete list of terms. BT STARS RT BAILYS BEADS CHROMOSPHERE DIAMOND RING EFFECT FILAMENTS [SOLAR] FLARES FRAUNHOFER LINES GRANULATION GRANULES HANLE EFFECT LOCAL STANDARD OF REST LUNAR ECLIPSE MACRO SPICULES MOTTLES PHOTOSPHERE PROMINENCES QUIESCENT PROMINENCES SOLAR CONSTANT SOLAR CORONA SOLAR ECLIPSE SOLAR PHYSICS SOLAR PLANETARY RELATIONS SOLAR SURFACE SOLAR SYSTEM SOLAR TERRESTRIAL RELATIONS SPICULES sungrazers U KREUTZ SUNGRAZERS SUNLIGHT RT SKY BRIGHTNESS SOLAR CONSTANT TWILIGHT SUNSPOT CYCLE RT BUTTERFLY DIAGRAM MAUNDER MINIMUM SOLAR ACTIVITY SOLAR CYCLE SUNSPOTS SUNSPOT GROUPS NT BIPOLAR GROUPS RT SOLAR ACTIVITY SUNSPOT NUMBERS SUNSPOT NUMBERS UF relative sunspot number wolf number RT BUTTERFLY DIAGRAM MAUNDER MINIMUM SOLAR ACTIVITY SOLAR CYCLE SUNSPOT GROUPS SUNSPOTS RT ACTIVE SUN BIPOLAR GROUPS BUTTERFLY DIAGRAM EVERSHED EFFECT FILAMENTS [SOLAR] MAGNETIC FIELDS MAGNETIC STORMS PENUMBRA PLAGES PROMINENCES SOLAR ACTIVITY STARSPOTS SUNSPOT CYCLE UMBRA WILSON EFFECT SUNYAEV ZELDOVICH EFFECT RT BACKGROUND RADIATION CLUSTERS OF GALAXIES INTRACLUSTER MATTER MICROWAVE BACKGROUND X RAY EMISSION SUPERCLUSTERS RT CLUSTERS OF GALAXIES SUPERGIANT STARS BT HIGH LUMINOSITY STARS POSTMAINSEQUENCE STARS NT A SUPERGIANT STARS B SUPERGIANT STARS EARLY TYPE SUPERGIANT STARS F SUPERGIANT STARS G SUPERGIANT STARS K SUPERGIANT STARS LATE TYPE SUPERGIANT STARS O SUPERGIANT STARS RT HUBBLE SANDAGE VARIABLE STARS HYPERGIANT STARS IRREGULAR VARIABLE STARS Lc VARIABLE STARS R CORONAE BOREALIS STARS SEMIREGULAR VARIABLE STARS SUPERMASSIVE STARS SUPERGRANULATION BT GRANULATION RT SOLAR SURFACE superluminal motion U APPARENT SUPERLUMINAL MOTION SUPERMASSIVE STARS RT MASSIVE STARS SUPERGIANT STARS SUPERNOVA ENVELOPES RT SHOCK WAVES SUPERNOVAS SUPERNOVA REMNANTS RT BLACK HOLES NEUTRON STARS PULSARS RADIO SOURCES WHITE DWARF STARS WHITE HOLES X RAY SOURCES SUPERNOVAS UF presupernovas BT CATACLYSMIC VARIABLE STARS HIGH LUMINOSITY STARS RT e PROCESS FROZEN IN ELEMENTS GRAVITATIONAL COLLAPSE MASS LOSS NEUTRINOS NOVAS NUCLEAR FUSION NUCLEOSYNTHESIS OPIK THEORY OPTICAL OUTBURSTS p PROCESS PROGENITORS PULSARS r PROCESS RUNAWAY STARS s PROCESS SHOCKS SUPERNOVA ENVELOPES SUPPORT SYSTEMS SUPPORT SYSTEMS Combine with other terms RT INSTRUMENTATION SUPERNOVAS TELESCOPES SURFACE BRIGHTNESS BT BRIGHTNESS RT GRAVITY DARKENING PHOTOSPHERE SURFACE PHOTOMETRY TEMPERATURE VON ZEIPEL THEOREM SURFACE GRAVITY UF acceleration of gravity RT DIAMETERS GRAVITATIONAL FORCE GRAVITY DARKENING LINE WIDTHS LUMINOSITY LUMINOSITY CLASSIFICATION MASS SURFACE PHOTOMETRY UF area photometry BT PHOTOMETRY RT DRIFT SCANS GALAXIES ISOPHOTES NEBULAE SURFACE BRIGHTNESS SURFACE PROPERTIES Combine with other terms BT PROPERTIES RT ALBEDO SURFACES [CELESTIAL BODIES] RT DUST STORMS GEOLOGY LUNAR DOMES MARIA MOON PETROLOGY PHOTOSPHERE PLANETS SATELLITES TOPOGRAPHY VOLATILES VOLCANOES WATER ICE SURFACES [OPTICAL] RT ALUMINUM COATINGS ANTIREFLECTION COATINGS FIGURING LENSES MIRRORS POLISHING SILVER COATINGS THIN FILMS SURVEYS NT SKY SURVEYS ULTRAVIOLET SURVEYS X RAY SURVEYS RT ATLASES CATALOGS RADIO SOURCE COUNTS STAR DISTRIBUTION SWAN BANDS BT MOLECULAR BANDS RT CARBON MONOXIDE MOLECULAR SPECTRA SX ARIETIS STARS UF helium variable stars BT ALPHA2 CANUM VENATICORUM STARS CATACLYSMIC VARIABLE STARS EARLY TYPE VARIABLE STARS ERUPTIVE BINARY STARS MAGNETIC VARIABLE STARS U GEMINORUM STARS SX PHOENICIS STARS BT MULTIPERIODIC VARIABLE STARS POPULATION II STARS PULSATING VARIABLE STARS symbiotic novas U NOVAS SYMBIOTIC STARS SYMBIOTIC STARS UF symbiotic novas BT CATACLYSMIC VARIABLE STARS EMISSION LINE STARS ERUPTIVE BINARY STARS NT Z ANDROMEDAE STARS RT DUST SHELLS P CYGNI LINE PROFILES X RAY BINARY STARS SYMBOLS RT UNITS SYNCHRONOUS DETECTORS BT DETECTORS SYNCHRONOUS ROTATION BT ROTATION RT CLOSE BINARY STARS ORBITS ROTATING STARS SYNCHROTRON RADIATION BT RADIATION NT CYCLOTRON RADIATION GYROSYNCHROTRON RADIATION RT BREMSSTRAHLUNG MAGNETOHYDRODYNAMICS NONTHERMAL SOURCES RADIATION MECHANISMS RAZIN EFFECT RELATIVISTIC ELECTRONS SYNODIC PERIOD RT CONJUNCTION OPPOSITION PLANETS SOLAR SYSTEM SYZYGY synthetic aperture U APERTURE SYNTHESIS SYSTEMS Combine with other terms SYZYGY Conjunction or opposition of planets. RT CONJUNCTION OPPOSITION PLANETS SYNODIC PERIOD T ARRAYS BT ARRAYS RADIO INTERFEROMETERS RT Y ARRAYS T ASSOCIATIONS BT STAR ASSOCIATIONS RT FLARE STARS FLASH STARS FU ORIONIS STARS H ALPHA EMISSION LINE STARS HERBIG HARO OBJECTS IRREGULAR VARIABLE STARS PREMAINSEQUENCE STARS RW AURIGAE STARS T TAURI STARS YOUNG STAR CLUSTERS YOUNG STARS T TAURI STARS UF yy orionis stars BT EMISSION LINE STARS IRREGULAR VARIABLE STARS PREMAINSEQUENCE STARS NT FU ORIONIS STARS RT EMISSION NEBULAE HERBIG HARO OBJECTS PROTOSTARS RW AURIGAE STARS T ASSOCIATIONS TAILS RT COMETS HEAD TAIL GALAXIES INTERACTING GALAXIES STREAMERS TANGENTIAL VELOCITY BT VELOCITY RT ORBITAL VELOCITY RADIAL VELOCITY TAXONOMY RT CLASSIFICATION TEACHING IN ASTRONOMY UF education TECHNETIUM LINES BT METAL LINES SPECTRAL LINES TECHNETIUM STARS RT N STARS S STARS TEKTITES BT METEORITES NT AUSTRALITES BEDIASITES INDOCHINITES MOLDAVITES TELESCOPE ARRAYS BT ARRAYS RT FILLING FACTOR INTERFEROMETERS TELESCOPES TELESCOPE CONSTRUCTION RT TELESCOPES TELESCOPE DESIGN RT TELESCOPE MOUNTINGS TELESCOPES telescope domes U DOMES TELESCOPE INSTRUMENTATION Not a complete list of terms. BT INSTRUMENTATION NT PHOTOMETERS POLARIMETERS SPECTROGRAPHS RT CONTROL SYSTEMS DETECTORS FEED HORNS FEEDS REMOTE CONTROL SYSTEMS SPECTROPHOTOMETERS TELESCOPES TELESCOPE MIRRORS BT MIRRORS NT PRIMARY MIRRORS SECONDARY MIRRORS RT TELESCOPES TELESCOPE MOUNTINGS NT ALTAZIMUTH MOUNTING EQUATORIAL MOUNTING RT COELOSTATS HELIOSTATS POLAR AXIS SIDEROSTATS TELESCOPE DESIGN TELESCOPES TELESCOPES Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. BT OPTICAL INSTRUMENTS NT AUTOMATED TELESCOPES GAMMA RAY TELESCOPES INFRARED TELESCOPES OPTICAL TELESCOPES RADIO TELESCOPES SOLAR TELESCOPES SPACE TELESCOPES RT ABERRATIONS ANTENNAS CONTROL SYSTEMS DOMES DRIVES FOCUS GUIDE SYSTEMS OBSERVATORIES POINTING ACCURACY POINTING ERRORS REMOTE CONTROL SYSTEMS SUPPORT SYSTEMS TELESCOPE ARRAYS TELESCOPE CONSTRUCTION TELESCOPE DESIGN TELESCOPE INSTRUMENTATION TELESCOPE MIRRORS TELESCOPE MOUNTINGS VIGNETTING TELEVISION UF tv RT TELEVISION CAMERAS TELEVISION DETECTORS television camera tubes U TELEVISION DETECTORS TELEVISION CAMERAS UF tv cameras RT TELEVISION TELEVISION DETECTORS TWO DIMENSIONAL DETECTORS TELEVISION DETECTORS UF television camera tubes tv cameras BT MULTICHANNEL DETECTORS PHOTOELECTRONIC DEVICES TWO DIMENSIONAL DETECTORS RT CCD DETECTORS TELEVISION TELEVISION CAMERAS TELLURIC LINES From earth's atmosphere. BT SPECTRAL LINES RT EARTH ATMOSPHERE SPECTRAL BANDS TEMPERATURE Combine with other terms NT BRIGHTNESS TEMPERATURE EFFECTIVE TEMPERATURE ION TEMPERATURE RT ABSOLUTE TEMPERATURE SCALE CELSIUS TEMPERATURE SCALE COLOR EMISSIVITY LIMB BRIGHTENING LIMB DARKENING RADIATIVE EQUILIBRIUM SPECTRAL TYPES SURFACE BRIGHTNESS THERMAL CONDUCTIVITY THERMODYNAMICS TEMPERATURE CONTROL RT AIR CONDITIONING CRYOGENICS CRYOSTATS DOMES TEMPERATURE DISTRIBUTION VENTILATION TEMPERATURE DISTRIBUTION RT TEMPERATURE CONTROL TEMPERATURE ZONES TEMPERATURE EFFECTS Combine with other terms UF thermal effects TEMPERATURE FLUCTUATIONS Combine with other terms TEMPERATURE SCALES NT ABSOLUTE TEMPERATURE SCALE CELSIUS TEMPERATURE SCALE RT KELVIN TEMPERATURE ZONES RT ATMOSPHERES STELLAR INTERIORS TEMPERATURE DISTRIBUTION TERMINATOR LINES RT PHASE [MOON] terrestrial atmosphere U EARTH ATMOSPHERE terrestrial physics U GEOPHYSICS terrestrial planets U INNER PLANETS TERRESTRIAL RADIATION NT ATMOSPHERIC RADIATION RT GREENHOUSE EFFECT INFRARED RADIATION TESTING Combine with other terms the galaxy U MILKY WAY GALAXY theoretical astrophysics U ASTROPHYSICS THEORY Combine with other terms RT RESEARCH thermal black body radiation U BLACK BODY RADIATION THERMAL CONDUCTIVITY RT CONDUCTION TEMPERATURE thermal effects U TEMPERATURE EFFECTS THERMAL EMISSION RT FREE FREE EMISSION INFRARED EMISSION THERMAL EQUILIBRIUM RT LOCAL THERMODYNAMIC EQUILIBRIUM SAHA EQUATION THERMAL INSTABILITY THERMODYNAMIC EQUILIBRIUM THERMODYNAMICS THERMAL HISTORY Combine with other terms THERMAL INSTABILITY RT CONVECTION LOCAL THERMODYNAMIC EQUILIBRIUM THERMAL EQUILIBRIUM THERMODYNAMIC EQUILIBRIUM TURBULENCE [EARTH ATMOSPHERE] TURBULENCE [STAR ATMOSPHERE] THERMAL PROPERTIES Combine with other terms BT PROPERTIES THERMAL RADIATION BT RADIATION RT BLACK BODY RADIATION INFRARED RADIATION JOHNSON NOISE THERMAL STABILITY RT LOCAL THERMODYNAMIC EQUILIBRIUM RAYLEIGH NUMBER THERMODYNAMIC EQUILIBRIUM THERMAL STRUCTURE Combine with other terms RT CONVECTION TURBULENCE [EARTH ATMOSPHERE] TURBULENCE [STAR ATMOSPHERE] THERMIONIC EMISSION UF dark current RT CATHODES ELECTRONS IONS THERMODYNAMIC EQUILIBRIUM NT LOCAL THERMODYNAMIC EQUILIBRIUM RT ENERGY TRANSFER THERMAL EQUILIBRIUM THERMAL INSTABILITY THERMAL STABILITY THERMODYNAMICS THERMODYNAMICS RT ADIABATIC PROCESS ENERGY TRANSFER ENTHALPY ENTROPY LOCAL THERMODYNAMIC EQUILIBRIUM PLASMAS TEMPERATURE THERMAL EQUILIBRIUM THERMODYNAMIC EQUILIBRIUM THERMOLUMINESCENCE BT LUMINESCENCE THERMONUCLEAR REACTIONS See NUCLEAR FUSION THERMOSPHERE RT EARTH ATMOSPHERE EXOSPHERE IONOSPHERE MESOPAUSE UPPER ATMOSPHERE THICKNESS Combine with other terms THIN FILMS BT OPTICAL FILMS NT ALUMINUM COATINGS ANTIREFLECTION COATINGS SILVER COATINGS RT COATINGS MIRRORS REFLECTION SURFACES [OPTICAL] VACUUM TECHNIQUES VAPOR DEPOSITION THOMSON SCATTERING BT COMPTON SCATTERING LIGHT SCATTERING RADIATION SCATTERING RT RAYLEIGH SCATTERING THREE BODY PROBLEM RT CELESTIAL MECHANICS N BODY PROBLEM ORBITS PERTURBATION STELLAR DYNAMICS TWO BODY PROBLEM three color photometry U JOHNSON PHOTOMETRY TIDAL DISRUPTION RT DIFFERENTIAL ROTATION ROCHE LIMIT STAR CLUSTERS TIDAL DISTORTION TIDAL FRICTION TIDAL INTERACTION TIDAL RADIUS TIDAL DISTORTION RT DIFFERENTIAL ROTATION INTERACTING GALAXIES TIDAL DISRUPTION TIDAL FRICTION TIDAL INTERACTION TIDAL FRICTION RT CLOSE BINARY STARS EARTH MOON SYSTEM INTERACTING BINARY STARS INTERACTING GALAXIES TIDAL DISRUPTION TIDAL DISTORTION TIDAL INTERACTION TIDES TIDAL INTERACTION RT INTERACTING BINARY STARS INTERACTING GALAXIES ROCHE LOBE TIDAL DISRUPTION TIDAL DISTORTION TIDAL FRICTION TIDAL RADIUS RT STAR CLUSTERS TIDAL DISRUPTION TIDES NT ATMOSPHERIC TIDES OCEAN TIDES POLAR TIDES RT TIDAL FRICTION TIME UF time determination time measurement NT CIVIL TIME DYNAMICAL TIME EPHEMERIS TIME MEAN SOLAR TIME SIDEREAL TIME UNIVERSAL TIME RT ASTROMETRIC INSTRUMENTS ATOMIC CLOCKS BESSELIAN EPOCH CALENDARS CHRONOMETERS CLOCKS EARTH ORBIT EARTH ROTATION EPHEMERIDES EPOCH GENERAL THEORY OF RELATIVITY GREGORIAN CALENDAR JULIAN DATE JULIAN EPOCH TRANSIT INSTRUMENTS TRANSIT TIME YEAR time determination U TIME time measurement U TIME TIME RESOLVED SPECTROSCOPY BT SPECTROSCOPY RT HIGH SPEED PHOTOMETERS VARIABLE STARS TIME SIGNALS RT TIME STANDARDS TIME SYNCHRONIZATION TIME STANDARDS RT ATOMIC CLOCKS CLOCKS TIME SIGNALS TIME SYNCHRONIZATION TIME SYNCHRONIZATION RT ATOMIC CLOCKS RADIO INTERFEROMETRY TIME SIGNALS TIME STANDARDS VERY LONG BASELINE INTERFEROMETRY timing devices U TIMING EQUIPMENT TIMING EQUIPMENT UF timing devices NT CLOCKS PENDULUMS TIP TILT MIRRORS RT ACTIVE OPTICS SEEING SEGMENTED OPTICS titius bode law U BODES LAW TOPOGRAPHY Combine with other terms RT EARTH PLANETS SATELLITES SURFACES [CELESTIAL BODIES] TORI Plural of torus RT CIRCUMSTELLAR DISKS INTERSTELLAR MATTER TOTAL ECLIPSES BT ECLIPSES RT ANNULAR ECLIPSES ECLIPSING BINARY STARS PARTIAL ECLIPSE UMBRA total magnitude U INTEGRATED MAGNITUDE tower telescope U SOLAR TELESCOPES TRACE ELEMENTS BT CHEMICAL ELEMENTS RT METAL ABUNDANCE TRACKING RT AUTOGUIDERS CONTROL SYSTEMS POINTING ACCURACY POINTING ERRORS TRAJECTORIES RT ORBITS TRANSFER FUNCTIONS NT MODULATION TRANSFER FUNCTION OPTICAL TRANSFER FUNCTION TRANSIT CIRCLES BT TRANSIT INSTRUMENTS RT TRANSIT TELESCOPES TRANSIT INSTRUMENTS BT ASTROMETRIC INSTRUMENTS NT MERIDIAN CIRCLES TRANSIT CIRCLES TRANSIT TELESCOPES RT ASTROMETRY MERIDIAN OBSERVATIONS TIME TRANSITS TRANSIT TELESCOPES BT TRANSIT INSTRUMENTS NT ZENITH TELESCOPES RT MERIDIAN OBSERVATIONS TRANSIT CIRCLES TRANSIT TIME TRANSIT TIME RT HOUR ANGLE MERIDIAN OBSERVATIONS RIGHT ASCENSION SIDEREAL TIME TIME TRANSIT TELESCOPES TRANSITION PROBABILITIES RT LINE FORMATION LINE WIDTHS OSCILLATOR STRENGTHS SPECTRAL LINES TRANSITION REGION RT CHROMOSPHERE SOLAR CORONA TRANSITS RT ASTROMETRY ECLIPSES OCCULTATIONS TRANSIT INSTRUMENTS TRANSMISSION Combine with other terms RT ABSORPTION OPTICS REFLECTION REFRACTION TRANSPARENCY TRANSMISSION GRATINGS BT DIFFRACTION GRATINGS NT OBJECTIVE GRATINGS RT ECHELLE GRATINGS GRISMS REFLECTION GRATINGS TRANSPARENCY RT ABSORPTION COEFFICIENT ATMOSPHERIC WINDOWS OPACITY TRANSMISSION TRANSPLUTONIAN PLANETS RT SOLAR SYSTEM TRANSPORT PROCESSES RT RADIATIVE TRANSFER TRANSVERSE VELOCITY BT VELOCITY RT PROPER MOTIONS RADIAL VELOCITY SPACE MOTION TRIGONOMETRIC PARALLAX BT PARALLAXES RT ASTRONOMICAL UNIT DISTANCE NEARBY STARS triple stars U MULTIPLE STARS TROJAN GROUP BT MINOR PLANET FAMILIES RT AMOR GROUP APOLLO GROUP TROPIC OF CANCER RT SOLSTICES SUMMER SOLSTICE TROPIC OF CAPRICORN TROPIC OF CAPRICORN RT SOLSTICES TROPIC OF CANCER WINTER SOLSTICE TROPICAL YEAR BT YEAR RT EARTH ORBIT TROPOPAUSE RT EARTH ATMOSPHERE STRATOSPHERE TROPOSPHERE TROPOSPHERE RT EARTH EARTH ATMOSPHERE EXOSPHERE TROPOPAUSE true anomaly U ANOMALY TRUE POSITIONS BT POSITIONS RT APPARENT POSITIONS ASTROMETRY COORDINATE SYSTEMS TULLY FISHER RELATION RT COSMOLOGY GALAXIES LINE WIDTHS REDSHIFT TURBIDITY RT HALATION PHOTOGRAPHIC EMULSIONS TURBULENCE [EARTH ATMOSPHERE] In earth's atmosphere NT MACROTURBULENCE MICROTURBULENCE RT CONVECTION EARTH ATMOSPHERE POINT SPREAD FUNCTION SCINTILLATION SEEING THERMAL INSTABILITY THERMAL STRUCTURE TURBULENCE [STAR ATMOSPHERE] In stellar atmospheres or in interstellar matter. NT MACROTURBULENCE MICROTURBULENCE RT CONVECTION LINE BROADENING STELLAR ATMOSPHERES THERMAL INSTABILITY THERMAL STRUCTURE TURNOFF POINT RT AGE GIANT BRANCH GLOBULAR STAR CLUSTERS HERTZSPRUNG RUSSELL DIAGRAM MAINSEQUENCE OPEN STAR CLUSTERS tv U TELEVISION tv cameras U TELEVISION CAMERAS TELEVISION DETECTORS twenty one cm line U 21 CM LINE TWILIGHT RT EARTH ATMOSPHERE SKY BRIGHTNESS SUNLIGHT twinkling U ATMOSPHERIC SCINTILLATION TWO BODY PROBLEM RT BINARY STARS CELESTIAL MECHANICS EARTH MOON SYSTEM N BODY PROBLEM PLANETS STELLAR DYNAMICS THREE BODY PROBLEM TWO COLOR DIAGRAMS RT COLOR INDICES PHOTOMETRY TWO COLOR PHOTOMETRY BT BROAD BAND PHOTOMETRY RT BV PHOTOMETRY JOHNSON PHOTOMETRY TWO DIMENSIONAL DETECTORS BT DETECTORS NT CCD DETECTORS IMAGE TUBES TELEVISION DETECTORS RT CHARGE COUPLED DEVICES CHARGE INJECTION DEVICES CHARGE TRANSFER DEVICES FLAT FIELDS IMAGE PROCESSING PIXEL TELEVISION CAMERAS TWO DIMENSIONAL SPECTRA BT SPECTRA RT EXTENDED OBJECTS LONG SLIT SPECTRA TWO DIMENSIONAL SPECTROSCOPY TWO DIMENSIONAL SPECTROSCOPY BT SPECTROSCOPY RT TWO DIMENSIONAL SPECTRA two reflector antennas U CASSEGRAIN ANTENNAS TWO SPECTRUM BINARY STARS UF spectrum binary stars BT SPECTROSCOPIC BINARY STARS U GEMINORUM STARS UF dwarf novas BT CATACLYSMIC VARIABLE STARS CLOSE BINARY STARS ERUPTIVE BINARY STARS NT SS CYGNI STARS SU URSAE MAJORIS STARS SX ARIETIS STARS WZ SAGITTAE STARS RT ACCRETION DISKS AM CANUM VENATICORUM STARS EMISSION LINE STARS UV PERSEI STARS UX URSAE MAJORIS STARS X RAY BINARY STARS Z CAMELOPARDALIS STARS U MAGNITUDE BT APPARENT MAGNITUDES RT JOHNSON PHOTOMETRY ULTRAVIOLET PHOTOMETRY UBV photometry U JOHNSON PHOTOMETRY UBVGRI photometry U GENEVA PHOTOMETRY UBVRI photometry U JOHNSON PHOTOMETRY UBVRIJKL PHOTOMETRY UBVRIJKL PHOTOMETRY UF UBVRI photometry BT BROAD BAND PHOTOMETRY RT JOHNSON PHOTOMETRY UcBV photometry U CAPE PHOTOMETRY ultra short period B stars U BETA CEPHEI STARS ultra short period variable stars U BETA CEPHEI STARS DELTA SCUTI STARS ULTRAVIOLET Combine with other terms UF uv ULTRAVIOLET ASTRONOMY UF uv astronomy BT SPACE ASTRONOMY RT BALLOON BORNE INSTRUMENTS ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE OBSERVATORIES ULTRAVIOLET TELESCOPES ULTRAVIOLET BACKGROUND BT BACKGROUND RADIATION ULTRAVIOLET RADIATION RT GAMMA RAY BACKGROUND MICROWAVE BACKGROUND RADIO BACKGROUND X RAY BACKGROUND ULTRAVIOLET CAMERAS BT CAMERAS ULTRAVIOLET COLORS RT ULTRAVIOLET PHOTOMETRY ULTRAVIOLET CONTINUUM BT CONTINUUM RADIATION ULTRAVIOLET RADIATION ULTRAVIOLET DETECTORS BT DETECTORS RT PHOTOMETERS ULTRAVIOLET EXCESS STARS UF uv excess stars NT RW AURIGAE STARS RT METAL DEFICIENT STARS METAL POOR STARS ULTRAVIOLET EXTINCTION In earth's atmosphere. RT ATMOSPHERIC EXTINCTION ULTRAVIOLET FILTERS RT INTERFERENCE FILTERS OPTICAL FILTERS ultraviolet light U ULTRAVIOLET RADIATION ULTRAVIOLET LINES BT SPECTRAL LINES RT LINE SPECTRA ULTRAVIOLET LUMINOSITY BT LUMINOSITY ultraviolet objects U ULTRAVIOLET SOURCES ULTRAVIOLET PHOTOGRAPHY BT PHOTOGRAPHY RT CAMERAS ULTRAVIOLET PHOTOMETRY BT BROAD BAND PHOTOMETRY MEDIUM BAND PHOTOMETRY PHOTOMETRY RT U MAGNITUDE ULTRAVIOLET COLORS ULTRAVIOLET RADIATION ULTRAVIOLET RADIATION UF ultraviolet light BT ELECTROMAGNETIC WAVES RADIATION NT EXTREME ULTRAVIOLET RADIATION FAR ULTRAVIOLET RADIATION NEAR ULTRAVIOLET RADIATION ULTRAVIOLET BACKGROUND ULTRAVIOLET CONTINUUM RT BLACK BODY RADIATION CERENKOV RADIATION LINE BLANKETING LYMAN CONTINUUM LYMAN SERIES ULTRAVIOLET PHOTOMETRY ULTRAVIOLET SPECTROGRAPHS ULTRAVIOLET SOURCES UF ultraviolet objects NT EARLY TYPE STARS ULTRAVIOLET SPECTROGRAPHS BT SPECTROGRAPHS RT ULTRAVIOLET RADIATION ULTRAVIOLET SURVEYS BT SURVEYS RT CATALOGS ULTRAVIOLET TELESCOPES BT SPACE TELESCOPES RT ULTRAVIOLET ASTRONOMY UMBRA RT ECLIPSES LUNAR ECLIPSE PENUMBRA SOLAR ECLIPSE SUNSPOTS TOTAL ECLIPSES WILSON EFFECT ZONE OF TOTALITY UNITS Of measurement. RT METROLOGY SYMBOLS UNIVERSAL TIME BT TIME RT CIVIL TIME EPHEMERIS TIME MEAN SOLAR TIME SOLAR DAY YEAR UNIVERSE See also under COSMOLOGY UF cosmos RT COSMOGONY COSMOLOGY LARGE SCALE STRUCTURE METAGALAXY UNSHARP MASKING RT PHOTOGRAPHIC PROCESSING PHOTOGRAPHY unstable stars U INTRINSIC VARIABLE STARS UPPER ATMOSPHERE Earth's atmosphere. RT AURORAS EARTH ATMOSPHERE EXOSPHERE IONOSPHERE MAGNETOSPHERE MESOSPHERE THERMOSPHERE VAN ALLEN RADIATION BELTS UPSILON SAGITTARII STARS BT ECLIPSING BINARY STARS URCA PROCESSES BT NUCLEAR REACTIONS UU HERCULIS STARS BT CATACLYSMIC VARIABLE STARS uv U ULTRAVIOLET uv astronomy U ULTRAVIOLET ASTRONOMY UV CETI STARS BT FLARE STARS VARIABLE SOURCES RT FLASH STARS uv excess stars U ULTRAVIOLET EXCESS STARS UV PERSEI STARS BT CATACLYSMIC VARIABLE STARS RT U GEMINORUM STARS uvby system U STROMGREN PHOTOMETRY UX URSAE MAJORIS STARS UF nova like variable stars BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS RT SU URSAE MAJORIS STARS U GEMINORUM STARS WHITE DWARF STARS Z CAMELOPARDALIS STARS V MAGNITUDE BT APPARENT MAGNITUDES RT JOHNSON PHOTOMETRY PHOTOVISUAL MAGNITUDES VISUAL MAGNITUDE VACUUM RT PRESSURE SPACE VACUUM TECHNIQUES RT ALUMINIZING ALUMINUM COATINGS OUTGASSING THIN FILMS VAPOR DEPOSITION VAN ALLEN RADIATION BELTS BT RADIATION BELTS RT MAGNETOHYDRODYNAMICS UPPER ATMOSPHERE VAPOR DEPOSITION RT ALUMINUM COATINGS COATINGS THIN FILMS VACUUM TECHNIQUES VARIABILITY Combine with other terms VARIABLE SOURCES BT RADIO SOURCES NT ACTIVE GALACTIC NUCLEI BL LACERTAE OBJECTS UV CETI STARS RT QUASARS VARIABLE STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. NT CATACLYSMIC VARIABLE STARS ECLIPSING BINARY STARS ELLIPSOIDAL VARIABLE STARS INTRINSIC VARIABLE STARS IRREGULAR VARIABLE STARS PECULIAR VARIABLE STARS PULSATING VARIABLE STARS SEMIREGULAR VARIABLE STARS RT AMPLITUDES COMPARISON STARS FUNDAMENTAL FREQUENCY H ALPHA EMISSION LINE STARS HE+ IONIZATION ZONE HIGH SPEED PHOTOMETERS LIGHT CURVES MAXIMA MINIMA OH IR STARS PERIOD PERIOD DETERMINATION PHASE SHIFT PHASE [WAVE] PURKINJE EFFECT TIME RESOLVED SPECTROSCOPY VELOCITY CURVES VISUAL OBSERVATIONS VBLUW photometry U WALRAVEN PHOTOMETRY VELOCITY Combine with other terms NT ANGULAR VELOCITY ESCAPE VELOCITY HELIOCENTRIC VELOCITY ORBITAL VELOCITY PARABOLIC VELOCITY PECULIAR VELOCITY RADIAL VELOCITY RELATIVISTIC VELOCITY TANGENTIAL VELOCITY TRANSVERSE VELOCITY RT HIGH VELOCITY CLOUDS HIGH VELOCITY STARS KINEMATICS MOMENTUM VELOCITY CURVES VELOCITY DISTRIBUTION VELOCITY ELLIPSOID VELOCITY FIELD VELOCITY SPACE VELOCITY CURVES RT LIGHT CURVES MAXIMA MINIMA PERIOD PHASE SHIFT PHASE [WAVE] SPECTROSCOPIC BINARY STARS VARIABLE STARS VELOCITY VELOCITY DISPERSION RT CLUSTERS OF GALAXIES MISSING MASS STAR CLUSTERS VIRIAL THEOREM VELOCITY DISTRIBUTION RT CLUSTERS OF GALAXIES STAR CLUSTERS VELOCITY VIRIAL THEOREM VELOCITY ELLIPSOID RT VELOCITY VELOCITY FIELD Combine with other terms RT GALAXIES SHOCK WAVES VELOCITY VELOCITY OF LIGHT UF speed of light RT APPARENT SUPERLUMINAL MOTION ERGOSPHERE EVENT HORIZON LIGHT CONE LIGHT YEAR VELOCITY SPACE RT PHASE SPACE VELOCITY VENTILATION Combine with other terms RT AIR CONDITIONING DOME SEEING DOMES TEMPERATURE CONTROL VERNAL EQUINOX BT EQUINOXES RT AUTUMNAL EQUINOX VERTICAL CIRCLES RT ALTAZIMUTH MOUNTING MERIDIAN CIRCLES VERY LARGE ARRAYS UF vla BT ARRAYS RADIO TELESCOPES RT INTERFEROMETERS VERY LONG BASELINE INTERFEROMETERS VERY LARGE TELESCOPES BT NEW TECHNOLOGY TELESCOPES OPTICAL TELESCOPES RT MULTIPLE MIRROR TELESCOPES SEGMENTED OPTICS VERY LONG BASELINE INTERFEROMETERS UF vlbi BT INTERFEROMETERS RADIO INTERFEROMETERS RT LONG BASELINE INTERFEROMETERS VERY LARGE ARRAYS VERY LONG BASELINE INTERFEROMETRY UF vlbi BT INTERFEROMETRY RADIO INTERFEROMETRY RT ATOMIC CLOCKS LONG BASELINE INTERFEROMETRY RADIO ASTROMETRY TIME SYNCHRONIZATION VIBRATION RT AMPLITUDES ANTINODES NODES SEISMOLOGY STABILITY VIBRATIONAL SPECTRA BT SPECTRA RT MOLECULAR SPECTRA Q BRANCH VIGNETTING RT FIELD OF VIEW TELESCOPES WIDE FIELD TELESCOPES VILNIUS PHOTOMETRY BT MEDIUM BAND PHOTOMETRY RT GENEVA PHOTOMETRY VIRIAL THEOREM RT CLUSTERS OF GALAXIES GRAVITATION RADIAL VELOCITY STAR CLUSTERS VELOCITY DISPERSION VELOCITY DISTRIBUTION VISCOSITY RT PLASMAS VISIBILITY FUNCTION RT APERTURE SYNTHESIS INTERFERENCE FRINGES INTERFEROMETRY VISIBLE RADIATION Synonym: LIGHT. BT RADIATION RT LIGHT VISIBLE SPECTRUM BT SPECTRA RT CONTINUOUS SPECTRA LIGHT VISION NT COLOR VISION RT DARK ADAPTION IMAGES VISUAL ACUITY VISUAL ACUITY RT RESOLUTION VISION VISUAL BINARY STARS See also OPTICAL DOUBLE STARS. UF visual double stars [2] wide binary stars BT BINARY STARS RT OCCULTING DISK ORBITAL MOTIONS SEPARATION VISUAL OBSERVATIONS visual double stars [1] Chance alignment, not binary system. U OPTICAL DOUBLE STARS visual double stars [2] Gravitationally bound binary system. U VISUAL BINARY STARS VISUAL MAGNITUDE RT PHOTOVISUAL MAGNITUDES PURKINJE EFFECT V MAGNITUDE VISUAL OBSERVATIONS RT PURKINJE EFFECT VARIABLE STARS VISUAL BINARY STARS vla U VERY LARGE ARRAYS vlbi U VERY LONG BASELINE INTERFEROMETERS VERY LONG BASELINE INTERFEROMETRY VOIGT PROFILES RT ABSORPTION LINES LINE SPECTRA VOLATILES RT PLANETS SURFACES [CELESTIAL BODIES] VOLCANOES RT CRATERS PLANETS SATELLITES SURFACES [CELESTIAL BODIES] VON ZEIPEL THEOREM RT BINARY STARS GRAVITY GRAVITY DARKENING ROTATING STARS SURFACE BRIGHTNESS W URSAE MAJORIS STARS BT DETACHED BINARY STARS ECLIPSING BINARY STARS RT ALGOL VARIABLE STARS W VIRGINIS STARS BT POPULATION II CEPHEIDS PULSATING VARIABLE STARS NT BL HERCULIS STARS RT CEPHEIDS RR LYRAE STARS WALRAVEN PHOTOMETRY UF VBLUW photometry BT MEDIUM BAND PHOTOMETRY PHOTOMETRIC SYSTEMS WATER BT INTERSTELLAR MOLECULES RT WATER ICE WATER MASERS WATER VAPOR WATER ICE UF ice RT PLANETS SURFACES [CELESTIAL BODIES] WATER WATER MASERS BT MASERS RT OH MASERS SiO MASERS WATER WATER VAPOR RT ATMOSPHERES PLANETS WATER WAVE MOTION BT MOTION RT INTERFERENCE [WAVES] SPECTROSCOPIC ANALYSIS WAVE PROPAGATION WAVE PROPAGATION RT REFRACTION SHOCK WAVES WAVE MOTION WAVES WAVEFORM ANALYSIS RT FOURIER ANALYSIS PERIOD DETERMINATION SPECTROSCOPIC ANALYSIS WAVEGUIDES NT OPTICAL WAVEGUIDES RADIO WAVEGUIDES WAVELENGTH Combine with other terms RT ACOUSTIC WAVES ELECTROMAGNETIC WAVES FREQUENCY WAVES NT ACOUSTIC WAVES DRIFT WAVES ELECTROMAGNETIC WAVES GRAVITATIONAL WAVES GRAVITY WAVES RT OSCILLATIONS WAVE PROPAGATION wc stars U WOLF RAYET STARS wcn stars U WOLF RAYET STARS WEAK G BAND STARS BT GIANT STARS METAL POOR STARS WEAK INTERACTIONS Between atomic particles BT INTERACTIONS NT FERMI INTERACTION RT NUCLEAR PHYSICS STRONG INTERACTIONS WHITE DWARF STARS UF da stars BT COLLAPSED STARS COMPACT OBJECTS DEGENERATE DWARF STARS EVOLVED STARS NT ZZ CETI STARS RT BLACK DWARF STARS CHANDRASEKHAR LIMIT SUPERNOVA REMNANTS UX URSAE MAJORIS STARS X RAY PULSARS WHITE HOLES RT BLACK HOLES COSMOLOGY GRAVITATIONAL LENSES NAKED SINGULARITY SUPERNOVA REMNANTS WIDE ANGLE LENSES RT ALL SKY CAMERAS ALL SKY PHOTOGRAPHY CAMERAS wide band photometry U BROAD BAND PHOTOMETRY wide binary stars U BINARY STARS VISUAL BINARY STARS WIDE FIELD TELESCOPES BT REFLECTING TELESCOPES NT ALL SKY CAMERAS BAKER NUNN CAMERAS RT BOUWERS TELESCOPES MAKSUTOV TELESCOPES SCHMIDT TELESCOPES VIGNETTING WILSON BAPPU EFFECT RT ABSOLUTE MAGNITUDE Ca II EMISSION LINES K LINE LATE TYPE STARS WILSON EFFECT RT PENUMBRA SUNSPOTS UMBRA WINDOWS Combine with other terms NT ATMOSPHERIC WINDOWS GALACTIC WINDOWS RT INTERSTELLAR ABSORPTION WINTER SOLSTICE BT SOLSTICES RT SUMMER SOLSTICE TROPIC OF CAPRICORN wn stars U WOLF RAYET STARS WOLF DIAGRAM RT DARK NEBULAE INTERSTELLAR ABSORPTION wolf number U SUNSPOT NUMBERS WOLF RAYET STARS UF wc stars wcn stars wn stars wr stars BT EARLY TYPE EMISSION STARS RT CARBON STARS CIRCUMSTELLAR ENVELOPES EJECTA MASS LOSS O STARS wr stars U WOLF RAYET STARS WZ SAGITTAE STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS LONG PERIOD VARIABLE STARS U GEMINORUM STARS RT SU URSAE MAJORIS STARS X RAY ABSORPTION BT X RAY SPECTRA RT X RAY EMISSION X RAY ASTRONOMY BT SPACE ASTRONOMY RT BALLOON BORNE INSTRUMENTS ROCKET BORNE INSTRUMENTS SATELLITE BORNE INSTRUMENTS SPACE OBSERVATORIES X RAY SPECTROGRAPHS X RAY TELESCOPES X RAY BACKGROUND BT BACKGROUND RADIATION RT GAMMA RAY BACKGROUND MICROWAVE BACKGROUND RADIO BACKGROUND ULTRAVIOLET BACKGROUND X RAYS X RAY BINARY STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS INTERACTING BINARY STARS X RAY SOURCES RT BLACK HOLES HZ HERCULIS STARS NEUTRON STARS SYMBIOTIC STARS U GEMINORUM STARS X RAY BURSTS X RAY NOVAS X RAY PULSARS X RAY STARS X RAY BRIGHT POINTS RT CLOSE BINARY STARS INTERACTING BINARY STARS X RAY BURSTS BT BURSTS RT BURSTERS GAMMA RAY BURSTS HZ HERCULIS STARS NEUTRON STARS OPTICAL BURSTS RADIO BURSTS RAPID BURSTS X RAY BINARY STARS X RAY TRANSIENTS X RAY CONTINUUM BT CONTINUUM RADIATION X RAY SPECTRA X RAY DETECTORS BT DETECTORS RT PROPORTIONAL COUNTERS X RAY DIFFRACTION BT DIFFRACTION RT X RAY SCATTERING X RAY SPECTROSCOPY X RAY EMISSION BT EMISSION SPECTRA X RAY SPECTRA RT SUNYAEV ZELDOVICH EFFECT X RAY ABSORPTION X RAY FLARES BT FLARES RT ACTIVE GALAXIES ACTIVE STARS X RAY FLUORESCENCE BT FLUORESCENCE PHOTOLUMINESCENCE X RAY IDENTIFICATIONS RT OPTICAL IDENTIFICATIONS X RAY SOURCES X RAY LINES BT EMISSION LINES RT X RAY SPECTRA X RAY LUMINOSITY BT LUMINOSITY RT HIGH ENERGY RADIATION X RAY MAPS BT MAPS RT X RAY STRUCTURE X RAY NOVAS BT NOVAS RT X RAY BINARY STARS X RAY OBSERVATORIES BT SPACE OBSERVATORIES RT ARTIFICIAL SATELLITES OBSERVATORIES X RAY POLARIZATION BT POLARIZATION [WAVES] RT POLARIZED RADIATION X RAY PULSARS BT PULSARS NT HZ HERCULIS STARS RT NEUTRON STARS WHITE DWARF STARS X RAY BINARY STARS X RAY QUASARS BT QUASARS X ray radiation U X RAYS X RAY SCATTERING BT RADIATION SCATTERING RT COMPTON EFFECT X RAY DIFFRACTION X RAYS X RAY SOURCES NT ACTIVE GALACTIC NUCLEI ACTIVE GALAXIES RS CANUM VENATICORUM STARS X RAY BINARY STARS RT ERUPTIVE BINARY STARS OPTICAL IDENTIFICATIONS QUASARS RADIO GALAXIES RELATIVISTIC STARS SEYFERT GALAXIES SUPERNOVA REMNANTS X RAY IDENTIFICATIONS X RAY STARS X RAYS X RAY SPECTRA NT X RAY ABSORPTION X RAY CONTINUUM X RAY EMISSION RT X RAY LINES X RAYS X RAY SPECTROGRAPHS UF grazing incidence spectrographs BT SPECTROGRAPHS RT X RAY ASTRONOMY X RAY SPECTROMETERS BT SPECTROMETERS X RAY SPECTROSCOPY BT SPECTROSCOPY RT X RAY DIFFRACTION X RAY STARS BT ACTIVE STARS EMISSION LINE STARS RT RADIO STARS X RAY BINARY STARS X RAY SOURCES X RAY STRUCTURE RT X RAY MAPS X RAY SURVEYS BT SURVEYS X RAY TELESCOPES UF grazing incidence telescopes BT SPACE TELESCOPES RT X RAY ASTRONOMY X RAY TRANSIENTS RT X RAY BURSTS X RAYS Combine with other terms UF X ray radiation BT ELECTROMAGNETIC WAVES HIGH ENERGY RADIATION RADIATION RT X RAY BACKGROUND X RAY SCATTERING X RAY SOURCES X RAY SPECTRA Y ARRAYS BT ARRAYS RADIO INTERFEROMETERS RT T ARRAYS YAGI ANTENNAS BT ANTENNAS DIRECTIONAL ANTENNAS RADIO TELESCOPES RT HALF WAVE DIPOLES YEAR NT ANOMALISTIC YEAR COSMIC YEAR TROPICAL YEAR RT EPHEMERIS TIME LIGHT YEAR SIDEREAL TIME TIME UNIVERSAL TIME YOKE MOUNTING BT EQUATORIAL MOUNTING YOUNG DISK CEPHEIDS BT CEPHEIDS YOUNG STAR CLUSTERS BT OPEN STAR CLUSTERS RT OB STARS POPULATION I STARS T ASSOCIATIONS YOUNG STARS YOUNG STARS Only the broad classes are shown below. Specific types will be found under these, or from the Hierarchical List. BT POPULATION I STARS NT B STARS BLUE STRAGGLER STARS O STARS OB STARS PREMAINSEQUENCE STARS RT H II REGIONS OB ASSOCIATIONS R ASSOCIATIONS T ASSOCIATIONS YOUNG STAR CLUSTERS yy orionis stars U T TAURI STARS Z ANDROMEDAE STARS BT CLOSE BINARY STARS EMISSION LINE STARS SHELL STARS SYMBIOTIC STARS Z CAMELOPARDALIS STARS BT CATACLYSMIC VARIABLE STARS ERUPTIVE BINARY STARS RT SS CYGNI STARS SU URSAE MAJORIS STARS U GEMINORUM STARS UX URSAE MAJORIS STARS zams U ZERO AGE MAINSEQUENCE ZEEMAN SPLITTING UF line splitting spectral line splitting BT MAGNETO OPTICAL EFFECTS RT DOPPLER BROADENING LINE BROADENING LINE SHIFT NATURAL LINE WIDTH PASCHEN BACK EFFECT PRESSURE BROADENING STARK BROADENING ZENITH BT POLES RT CELESTIAL SPHERE HORIZON COORDINATE SYSTEM NADIR ZENITH DISTANCE RT ALTITUDE [ANGLE] ANGLE OF REFRACTION DIURNAL PARALLAX ZENITH HOURLY RATE RT METEOR SHOWERS ZENITH TELESCOPES UF photographic zenith tubes zenith tubes BT REFRACTING TELESCOPES TRANSIT TELESCOPES RT MERIDIAN OBSERVATIONS zenith tubes U ZENITH TELESCOPES UF photographic zenith tubes ZERO AGE HORIZONTAL BRANCH RT GIANT BRANCH HERTZSPRUNG RUSSELL DIAGRAM ZERO AGE MAINSEQUENCE ZERO AGE MAINSEQUENCE UF zams RT HERTZSPRUNG RUSSELL DIAGRAM MAINSEQUENCE ZERO AGE HORIZONTAL BRANCH ZERO POINT Combine with other terms zeta aurigae stars U MIRA VARIABLE STARS ZIRCONIUM STARS RT GIANT STARS HEAVY METAL STARS MOLECULAR BANDS S STARS ZODIAC RT ASTROLOGY CONSTELLATIONS EARTH ORBIT ECLIPTIC ZODIACAL DUST BT DUST RT GEGENSCHEIN INTERPLANETARY MATTER METEOROID DUST CLOUD METEOROIDS ZODIACAL LIGHT ZODIACAL DUST CLOUD See ZODIACAL DUST ZODIACAL LIGHT RT F CORONA GEGENSCHEIN INTERPLANETARY MATTER LIGHT SCATTERING NIGHT SKY BRIGHTNESS RADIATION SCATTERING SKY BRIGHTNESS ZODIACAL DUST ZONE OF TOTALITY RT SOLAR ECLIPSE UMBRA ZZ CETI STARS BT MULTIPERIODIC VARIABLE STARS PULSATING VARIABLE STARS WHITE DWARF STARS RT HE+ IONIZATION ZONE KAPPA MECHANISM NONRADIAL PULSATIONS ## {PAGE|6} The Thesaurus ## The Thesaurus {PAGE|63}