Appendix:Astronomical terms
A
aberration absolute magnitude absolute zero absorption lines accretion disk albedo Alpha Centauri altitude Andromeda Galaxy annular eclipse antapex anthelion apex aphelion apocenter apogee apparent magnitude arc Ariel armillary sphere arroyo asterism asteroid asteroid belt astrobiology astrolabe astrometeorology astrometric binary astrometry astronomer astronomical unit astronomy astrophotography astrophysics atmosphere atmosphere layers AU aureole aurora axis azimuth
B
barred spiral basin Becklin-Neugebauer object big bang model big crunch Big Dipper binary accretion model binary star biosphere black dwarf black hole blue moon blue shift Bode's law brightline spectrum brown dwarf
C
Callisto canals Canopus carbonaceous chondrites Cassegrain reflector celestial body celestial equator celestial mechanics celestial object celestial pole celestial sphere Ceres Chandrasekhar limit chaos Charon chondrite chromosphere cluster star coelostat collision coma cluster comet comet tail conjunction constellation Copernican system corona coronagraph cosmic noise cosmic rays cosmogony cosmological principle cosmology cosmos coude telescope Crab Nebula crater crescent moon cynosure
D
dark nebula declination deferent Deimos diffuse nebula dispersion Dog Star Doppler shift double star Dumbbell Nebula dust dwarf
E
Earth eccentricity eclipse eclipsing binary ecliptic ecosphere electromagnetic spectrum elliptical galaxy emission lines ephemeris epicycle epoch equant equinox ether Europa exosphere expanding universe extragalactic
F
fireball first point of Aries flash spectrum flocculus force field Fraunhofer lines full moon
G
galactic equator galactic noise galactic pole galaxy Galilean satellites Galilean telescope Ganymede gas giant Geiger counter Geiger-Muller tube geocentric geomagnetic axis gibbous moon globular cluster gnomon gravitation gravitation gravitational collapse gravitational lensing gravity anomaly great circle Great Wall
H
Halley's Comet halo harmonic law heavenly body heliocentric Hertzsprung-Russell diagram horizon horizon system Horsehead Nebula Hubble classification scheme
I
image-intensifier tube interacting galaxies intercrater plain interferometer intergalactic intergalactic medium interplanetary interplanetary medium interstellar cloud Io ionosphere irregular galaxy
J
K
L
Large Magellanic Cloud law of universal gravitation laws of motion lenticular galaxy light speed light year lines of force Little Dipper Local Group local supercluster Percival Lowell luminosity lunar lunar eclipse lunar occultation
M
Magellanic clouds magnetic field magnetic star magnetosphere magnitude main sequence major axis major planets mare Mare Imbrium Mars Martian versus martian mascon mass spectrometry mass-luminosity law Mercury meridian Messier object metagalaxy meteor meteor shower meteorite meteoroid microwave background radiation Milky Way minor planet Mira variable Miranda monochromator moon motion
N
nadir nebula Neptune Nereid neutron star New General Catalogue new moon Newtonian reflector Newton's law of universal gravitation Newton's laws of motion NGC no boundary condition nodes North Star Northern Lights nova nutation
O
Oberon objective observable universe observatory occultation Olympus Mons open cluster optical double orbit order of magnitude Orientale basin Orion Nebula orrery outer space outgassing
P
parallax parhelic circle parsec penumbra perigee perihelion period period-luminosity relation perturbation phase Phobos photometry photomultiplier tube photosphere planet planetarium planetary nebula planetesimal planetoid plasma plate tectonics Pluto polar cap Polaris polestar precession primary primordial black hole proper motion protoplanet protostar Proxima Centauri Ptolemaic system pulsar pulsating universe theory
Q
quarter moon quasar quintessence Quizzes Page
R
radar ranging radial velocity radiant radio astronomy radio beam radio galaxy radio source radio star radio telescope radio wave ray red dwarf red giant red shift red supergiant reflection nebula reflector refractor regolith retrograde motion rift valley right ascension Ring Nebula ring plain ring system Roche limit
S
satellite Saturn Saturn's rings Schmidt telescope School Profiles Page Schwarzschild radius seeing seismometer semimajor axis SETI sextant Seyfert galaxy shepherd satellite shooting star SI sidereal sidereal period sidereal time signal-to-noise ratio singularity Sirius Small Magellanic Cloud solar solar corona solar eclipse solar flare solar nebula solar system solar wind solstice space space velocity space velocity space-time spectral type spectrograph spectroheliograph spectroscopic binary spectroscopic parallax spectroscopy spectrum spectrum-luminosity diagram spicule spiral arm spiral galaxy star star cloud starburst galaxy stargazing steady state model sun sunspot supercluster supergiant star supermassive black hole supernova supernova remnant surface temperature synodic month syzgy
T
telescope terra terrestrial planets Tharsis ridge tidal friction tides Titan Titania transit trinary star Triton
U
umbra Umbriel universal gravitation universe uranography uranology uranometry Uranus
V
Van Allen radiation belts variable star Venus vertical circle Very Large Array Vesta Vigo cluster visible spectrum visual binary VLA
W
waning moon waxing moon whirlpool galaxy white dwarf white hole Widmanstatten figures