A-type main-sequence star
absolute magnitude
accretion disk
active galactic nucleus (AGN)
airborne observatory
albedo
Syrtis Major (center)
albedo feature
Alfvén surface
Am star
aphelion
apoapsis
apogee
apparent magnitude
Also visual brightness (V).
appulse
apsis
argument of periapsis
artificial satellite
ascending node
aspect
asterism
asteroid
asteroid belt
astrobiology
astrodynamics
astrogeology
astrometric binary
astrometry
astronomical body
astronomical catalogue
astronomical object
Also celestial object.
astronomical symbol
astronomical unit (AU)
astronomy
astrophotography
astrophysics
atmosphere
axial precession
axial tilt
axis of rotation
azimuth
B-type main-sequence star
Babcock model
barycenter
baryogenesis
Big Bang
binary star
black hole
blazar
break-up velocity
brown dwarf
bulge
calibrator star
celestial equator
celestial mechanics
celestial meridian
celestial pole
celestial sphere
centaur
central massive object (CMO)
chromosphere
chromospheric activity index
circumstellar disc
Also circumstellar disk.
cis-Neptunian object (CNO)
color index
comet
commensurability
common proper motion
compact star
compact stellar nucleus
conjunction
constellation
corona
coronal loop
coronal mass ejection (CME)
cosmic distance ladder
cosmic dust
cosmic microwave background (CMB)
cosmogony
cosmology
coudé spectrograph
critical rotation
critical velocity
culmination
debris disk
declination
decretion disk
deep-sky object (DSO)
degenerate star
descending node
detached object
direct motion
diurnal motion
double star
dust astronomy
dwarf planet
dwarf star
early-type star
eccentricity
ecliptic
ecliptic coordinate system
effective temperature
elliptical galaxy
elliptical orbit
elongation
ephemeris
epoch
equator
equatorial coordinate system
equinoctial
equinox
escape velocity
evolutionary track
extinction
extragalactic astronomy
extrasolar object
extrasolar planet
exobiology
F-type main-sequence star
facula
field galaxy
field star
field of view
first light
first magnitude star
First Point of Aries (♈︎)
First Point of Libra
flare star
Fulton gap
G-type main-sequence star
galactic astronomy
galactic anticenter
Galactic Center
galactic coordinate system
galactic corona
galactic nucleus
galactic period
galactic tide
galactocentric distance
galaxy
galaxy cluster
galaxy group
Galilean moons
gamma-ray astronomy
gamma-ray burst (GRB)
gas giant
geocenter
geocentric
geocentric zenith
geomagnetic storm
geometric albedo
geometric position
geostationary orbit
geosynchronous orbit (GSO)
giant planet
globular cluster
gravitational collapse
gravitational lens
gravitational-wave astronomy
H II region
heliocenter
heliocentric
heliopause
heliosphere
Hertzsprung–Russell diagram
Hill sphere
horizon
hour angle
hour circle
hybrid-chromosphere star
hybrid pulsator
hydrogen burning limit
hypergalaxy
ice giant
inclination
inferior planet
infrared astronomy
International Astronomical Union (IAU)
interstellar medium (ISM)
interstellar reddening
invariable plane
ionosphere
irregular galaxy
irregular moon
isochrone
Jeans instability
Julian year (a)
K-type main-sequence star
Kelvin–Helmholtz mechanism
Kepler orbit
Kuiper belt
Also Edgeworth–Kuiper belt.
Lagrangian point
Also Lagrange point, libration point, or L-point.
Laniakea Supercluster
late-type star
libration
light-year (ly)
limb
limb darkening
line of apsides
lobster-eye optics
Local Group
longitude of the ascending node (☊ or Ω)
luminosity
lunar
lunar phase
M-type main-sequence star
massive compact halo object (MACHO)
magnetic switchback
magnetosphere
magnitude
main sequence
major axis
March equinox
mean anomaly (M)
mean-motion resonance (MMR)
meridian
meridian astronomy
Messier object
meteor
meteorite
meteoroid
meteor shower
metallicity
micrometeorite
micrometeoroid
microvariable
Milky Way
minor axis
minor planet
minor-planet moon
molecular cloud
moment of inertia factor
moon
Moon
moonlet
moonmoon
Morgan–Keenan stellar classification system
morning width
moving cluster
moving group
multi-messenger astronomy
multiverse
N galaxy
nadir
natural satellite
near-Earth object (NEO)
nebula
neutrino
neutron star
New General Catalogue (NGC)
night sky
non-inclined orbit
nova
nuclear star cluster (NSC)
number density
nutation
O-type main-sequence star
OB association
obliquity
observation arc
observable universe
observational astronomy
occultation
Oort cloud
opacity
open cluster
opposition
orbit
orbit plot
orbital eccentricity
orbital elements
orbital inclination
orbital mechanics
orbital node
orbital period
orbital plane
orbital resonance
orbital speed
origin of longitude
orphan planet
osculating orbit
outer space
parallax
parsec (pc)
partial solar eclipse
peak magnitude
periapsis
perigee
perihelion
perturbation
phase angle
photometric system
photosphere
plane of reference
plane of the ecliptic
plane of the sky
planemo
planet
planetary
planetary body
planetary differentiation
planetary nebula
planetary science
planetary system
planetary-mass object (PMO)
planetesimal
planetoid
planetology
polar orbit
positional astronomy
precession
precession of the equinoxes
primary
prograde motion
projected separation
proper motion
proplyd
protoplanet
protoplanetary disk
protostar
pseudo-synchronous rotation
pulsar
quadratic field strength
quadrature
quasar
radial velocity
radio astronomy
radio source
red-giant branch
redshift
reference plane
regular moon
relativistic jet
réseau
retrograde motion
revolution period
right ascension
ring system
Roche limit
rogue planet
Rosseland optical depth
rotation period
rotational modulation
satellite galaxy
scattered disc
scintillation
secular
secular motion
seeing
selenocentric
semi-diameter
semi-major axis
September equinox
sidereal day
sidereal period
sidereal time
sidereal year
sky
solar day
solar eclipse
solar facula
solar flare
solar granule
solar jet
solar mass (M☉)
solar moss
solar prominence
solar radius (R☉)
solar storm
solar spicule
Solar System
solar time
solar wind
solstice
spectral classification
spectroscopic binary
spectroscopy
spherical astronomy
spiral galaxy
standard gravity (ɡ0 or ɡn)
star
star catalogue
star cluster
star system
starburst galaxy
starfield
stellar
stellar atmosphere
stellar classification
stellar designation
stellar dynamics
stellar envelope
stellar evolution
stellar evolution model
stellar magnetic field
stellar parallax
stellar remnant
submillimetre astronomy
subsatellite
substellar object
Sun
supercluster
superior planet
supermassive black hole (SMBH)
supernova
surface gravity (g)
synchronous orbit
synodic day
synodic period
synodic time
syzygy
tangential velocity
telescope
telluric star
termination shock
terminator
theoretical astronomy
thick disk population
thin disk population
tidal braking
tidal force
tidal locking
tidal stream
tilt erosion
Tisserand's parameter (T)
topocentric
total solar eclipse
trans-Neptunian object (TNO)
trojan
tropical year
true anomaly (ν, θ, or f)
Tully–Fisher relation
twilight
two-body problem
UBV photometric system
universe
variable star
velocity dispersion
Virgo Supercluster (Virgo SC)
walled plain
weak-line star
white dwarf
Wilson–Bappu effect
XBONG
X-ray source
zenith
zero-age main sequence (ZAMS)
zodiac
zodiacal light
Zone of Avoidance