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Astronomy Terms A-Z

Given a definition, how many can you name?
Quiz by
Polen
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Last updated: January 15, 2026
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First submittedNovember 26, 2025
Times taken395
Average score65.4%
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Definition
Answer
A
A minor planet; mostly found in a belt between Jupiter and Mars
Asteroid
B
A system where two celestial bodies orbit around each other
Binary system
C
A recognizable group of stars, such as Orion or Ursa Major
Constellation
D
A small body that does meet criteria for planetary status
Dwarf planet
E
Any object that is egg or ovular-shaped
Ellipsoid
F
Objects in the sky don't appear to move, also called a background star
Fixed star
G
Gases, stars, and other objects held together by gravity; What the Milky Way is
Galaxy
H
The boundary between a landscape and the sky, where the sun rises/sets
Horizon
I
The planets of Mercury, Venus, Earth, and Mars
Inner planet
J
Relating to the planet Jupiter
Jovian
K
Region of the Solar System beyond Neptune's orbit
Kuiper Belt
L
The distance that light travels in one Earth year, equal to about 5.88 trillion miles
Light-year
M
Also called a shooting star, an object that enters Earth's atmosphere
Meteor
N
Clouds of ionized gases, hydrogen, helium, and dust that may become stars
Nebula
O
The curved path of a body around another body
Orbit
P
The outermost part of a star, where light is radiated from
Photosphere
Q
An extremely active, galactic center
Quasar
R
When a body rotates, orbits, or moves in a different way from its usual
Retrograde
S
A huge explosion that occurs at the end of a star's life
Supernova
T
Tool often used by astronomers that captures and focuses light
Telescope
U
The entirety of space and time
Universe
V
A star that varies in brightness
Variable star
W
Stellar remnants that are much cooler and fainter than other stars
White dwarf
X
Light waves between ultraviolet and gamma rays on the spectrum
X-ray
Y
A stable star that is fusing hydrogen into helium. What the Sun is.
Yellow dwarf
Z
Point in a sky directly overhead of a viewer
Zenith
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6 Comments
DrewFan
+1
Level 73
Nov 26, 2025
It's "Yellow Dwarf" not "Yellow Warf"

Also, multiple clues make the answers easy to guess

Otherwise, good quiz!

Polen
+1
Level 67
Nov 26, 2025
Fixed the yellow dwarf misspelling and made a couple of clues a little harder!
DrewFan
+1
Level 73
Nov 26, 2025
Fix confirmed
KiloNova
+1
Level 61
Nov 26, 2025
Wonderful quiz! Nominated!
PeregrineFalcon
+1
Level 79
Jan 15, 2026
White dwarfs are not necessarily cool. Also I have never heard of field stars but after a quick search I'm not sure if the hint is correct. Sounds more like you mean 'fixed stars'.
Polen
+1
Level 67
Jan 15, 2026
Fixed!
Terms and Definitions
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