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Glossary Terms
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z
A
- A-type star
- Absolute Magnitude
- Absolute Zero
- absorption line
- Accelerating Universe
- accretion
- accretion disk
- Active Galactic Nucleus
- adaptive optics
- Alpha Centauri
- Altitude
- Andromeda
- Andromeda Galaxy
- Angular Diameter
- Angular Resolution
- Annual Parallax
- Annular Solar Eclipse
- Antarctic Circle
- Antimatter
- Aphelion
- Apoapsis
- Apoastron
- Apogee
- Apollo
- Apparent Magnitude
- Aquarius
- Arctic Circle
- Aries
- Artificial Satellite
- Asterism
- Asteroid
- Asteroid Belt
- Asteroid Family
- Astrobiology
- Astrochemistry
- Astrology
- Astronaut
- Astronomer
- Astronomical Observatory
- Astronomical Unit
- Astronomy
- Astrophysics
- Atmosphere
- Atmospheric Extinction
- Atom
- Atomic Structure
- Aurora
- Aurora Australis
- Aurora Borealis
- Autumn
- Autumn Equniox
- Axis
- Azimuth
C
- Calendar
- Cancer
- Capricornus
- Cataclysmic variable
- Celestial Body
- Celestial Coordinates
- Celestial Equator
- Celestial Pole
- Celestial Sphere
- Cepheid Variable
- Chromosphere
- Circumpolar Stars
- Cluster
- Cluster Of Galaxies
- Color
- Color Index
- Comet
- Comet Nucleus
- Cometary Coma
- Cometary Tail
- Conjunction
- Constellation
- convective zone
- Copernican Principle
- Copernican Revolution
- Corona
- Coronal Mass Ejection (CME)
- Cosmic Microwave Background (CMB)
- Cosmic Ray
- cosmic ray astronomy
- Cosmological Principle
- Cosmology
- Cosmos
- Crater
- Crescent Moon
E
- Earth
- Earth's axis
- Earth's Rotation
- Earth-like planet
- eccentricity
- Eclipse
- eclipsing binary
- Ecliptic
- Effective Temperature
- Electric Field
- Electromagnetic Force
- Electromagnetic Radiation
- Electron
- Ellipse
- Elliptical Galaxy
- emission line
- Energy
- Energy Level
- Equator
- Equinox
- Escape Velocity
- Exoplanet
- Extinction
- Extraterrestrial Intelligence
- Extraterrestrial Life
G
- G-type star
- Galactic bar
- Galactic Bulge
- Galactic Center
- Galactic Disk
- Galactic Halo
- Galaxy
- Galaxy Cluster
- Galilean Satellites
- Galilean Telescope
- Gamma Ray
- gamma ray burst
- Gas
- Gas Cloud
- Gas Giant
- Gemini
- Geocentric Model
- Geomagnetic Storm
- Giant Planet
- Giant Star
- Gibbous Moon
- Global Warming
- Globular Cluster
- Granulation
- Gravitational Constant
- Gravitational Lens
- Gravitational waves
- Gravity
- Great Red Spot
- Greenhouse Effect
- Greenwich Mean Time Zone (GMT)
J
P
- Parallax
- Parsec
- Partial Lunar Eclipse
- Partial Solar Eclipse
- Particle
- Particle Physics
- Penumbra
- Periapsis
- Periastron
- Perigee
- Perihelion
- Period
- Phase
- Photoelectric Effect
- Photometry
- Photon
- Photosphere
- Pisces
- Planet
- Planet Formation
- Planetarium
- Planetary Nebula
- Planetary Science
- Planetary system
- Planetesimal
- Plasma
- Pleiades
- Pluto
- Polar Axis
- Polar circle
- Polar Day
- Polar Night
- Polaris
- Pre-main sequence star
- Precession
- Prime meridian
- Proton
- Protoplanet
- Protoplanetary disk
- Protostar
- Proxima Centauri
- Pulsar
S
- Sagittarius
- Sagittarius A*
- Satellite
- Saturn
- Science
- Scientific Method
- Scientific Model
- Scorpio
- Seasons
- semi-major axis
- Shadow
- Shooting Star
- Sidereal Day
- Sidereal Time
- Sirius
- Sky
- Sky Map
- Small Magellanic Cloud (SMC)
- Small Solar System Body
- Solar calendar
- Solar Constant
- Solar Cycle
- Solar Day
- Solar Eclipse
- Solar Flare
- Solar Mass
- Solar Prominence
- Solar System
- Solar Wind
- Solar Year
- Solstice
- South Celestial Pole (SCP)
- South Pole
- Southern Cross
- Space
- Space Debris
- Space Station
- Space Telescope
- Space Weather
- Spacecraft
- spectral line
- Spectral Type
- Spectrograph
- Spectroscopy
- Spectrum
- Spiral arm
- Spiral Galaxy
- Spring
- Spring Equinox
- standard candle
- Star
- Star cluster
- Star Formation
- Star trail
- stellar activity
- stellar core
- Stellar Evolution
- Stellar Population
- Stellar Remnants
- Stellar Structure
- subdwarf star
- Subgiant star
- submillimeter astronomy
- Summer
- Summer Solstice
- Sun
- Sun Path (Day Arc)
- Sundial
- Sunspot
- Sunspot Cycle
- Supergiant star
- Supermassive Black Hole
- Supernova
- Supernova remnant
- Surface Brightness
T
- T-Tauri Star
- Taurus
- Telescope
- Temperature
- Terrestrial Planet
- Theory
- Theory of General Relativity
- Thermal Radiation
- Tidal force
- Tidal locking
- Tide
- Time
- Time Zone
- Titan
- Total Lunar Eclipse
- Total Solar Eclipse
- Trans-Neptunian Object
- Transit
- Triton
- Trojans
- Tropic
- Tropic of Cancer
- Tropic of Capricorn
- Tropical Year (Solar Year)
- Tropics
- twilight
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".