GAT: A Glossary of Astronomical Terms
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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 matter
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
exosolar planet
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
giant stars
gibbous moon
globular cluster
gnomon
gravitation
gravitational collapse
gravitational lensing
gravity anomaly
great circle
Great Wall
H
Halley's Comet
halo
harmonic law
heavenly body
heliocentric
helium
Hertzsprung-Russell diagram
horizon
horizon system
Horsehead Nebula
Hubble classification scheme
Hubble Space Telescope
hydrogen
hydrogen fusion
I
image-intensifier tube
interacting galaxies
intercrater plain
interferometer
intergalactic
intergalactic medium
interplanetary
interplanetary medium
interstellar cloud
Io
ionosphere
irregular galaxy
J
Jovian satellites
Jupiter
K
Kepler's laws
Kuiper Belt
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
Oort Cloud
open cluster
optical double
orbit
orbital velocity
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
Planet X
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
SALT
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
sol
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
T-Tauri
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
X
X-ray burster
X-ray
Y
Z
zenith
zodiacal light
zone
zone of avoidance
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