A
albedo
Alpha Centauri
apastron
aperture
aphelion
apogee
asterism
axial tilt
azimuth
B
background radiation
Bailey's beads
big bang theory
binary star
black body
black hole
bolometer
C
celestial
celestial equator
cislunar
cluster
conjunction
Coriolis force
cosmic rays
cosmology
cosmos
crater
crescent moon
D
dark matter
day
declination
deep space
Deneb
density
docking
Doppler shift
double star
Drake equation
dust
dwarf planet
dwarf star
E
earthbound
eclipse
elliptical orbit
equinox
escape velocity
event horizon
exoplanet
extragalactic
F
falling star
flare
flyby
free fall
full moon
G
gamma ray
gas giant
gegenschein
geostationary
geosynchronous
gibbous moon
globular cluster
gravitation
gravitational constant
gravitational lens
gravity
H
H-R diagram
half moon
heliocentric
helium
Hubble telescope
Hubble's law
hydrogen
hyperbolic orbit
hypernova
I
ice giant
inclination
inertia
inferior planets
inner planets
interstellar
interstellar dust
ionosphere
L
Lagrange points
lens
light-year
local arm
local group
lunar
M
magnitude
mare
mass
minor planet
Mir
muttnik
O
observatory
occultation
Oort cloud
opposition
orbit
outer planets
P
parallax
parsec
partial eclipse
perigee
perihelion
perturbation
phase
plane of the ecliptic
planetary nebula
planetoid
pole star
precession
probe
pulsar
Q-R
quarter moon
quasar
radiant
radiation
red dwarf
red giant star
red shift
revolve
right ascension
rings
Roche limit
rocket
S
satellite
scientific notation
scintillation
sidereal
singularity
sky
solar
solar wind
solstice
space
space station
spectroscope
spectrum
Sputnik
starlight
superior planets
supernova
synodic
syzygy
T
telemetry
terminator
terrestrial
total eclipse
totality
transit
translunar
transneptunian
twinkling
W
waning
wavelength
waxing
weightlessness
white dwarf
white giant
wormhole