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Solar System A-Z

For each letter A-Z, guess the answer that pertains to the Solar System and its properties.
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AnAmerican
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Last updated: December 14, 2025
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First submittedJune 10, 2025
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Letter
Clue
Answer
A
The Earth's average distance from the sun is one _________ unit
Astronomical
B
Study of life and evolution on Earth
Biology
C
Dwarf planet that makes up over one-third of all mass in the Asteroid Belt
Ceres
D
Small moon of Mars with an escape velocity of only 20 km/h
Deimos
E
Smallest of Jupiter's four Galilean moons
Europa
F
A burst of radiation on the surface of the Sun is called a solar _____
Flare
G
Biggest moon in the Solar System
Ganymede
H
Most common element found in the gas giants
Hydrogen
I
Exists in both water and carbon dioxide form on Mars
Ice
J
Adjective for something related to Jupiter
Jovian
K
Region beyond Neptune with many small icy objects and dwarf planets
Kuiper Belt
L
Of or relating to the Earth's moon
Lunar
M
Smallest planet and closest to the Sun
Mercury
N
Scientist who discovered the Law of Universal Gravitation
Newton
O
Highest point on Mars and the largest volcano in the Solar System
Olympus Mons
P
Former ninth planet before 2006
Pluto
Q
 
R
Due to gravity, Saturn's ____s are slowly disappearing and will eventually vanish
Ring
S
Brightest star as viewed from the Solar System besides the Sun
Sirius
T
Only moon in the Solar System with a substantial atmosphere
Titan
U
First country to land a probe on Venus
USSR
V
Furthest manmade object from Earth, about 25 billion kilometers away
Voyager 1
W
Largest and most powerful telescope in space: James ____
Webb
X
The Sun's corona and sunspots are more prominent with this imaging
X-ray
Y
Mexican peninsula where the Chicxulub asteroid impacted Earth
Yucatán
Z
Belt of twelve constellations developed by the Babylonians and Greeks
Zodiac
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1 Comments
bitstwenty
+2
Level 37
Jun 12, 2025
good
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