40 Planet Trivia Questions for Kids
Try planet trivia for kids with icy moons, unusual rings and distant dwarf worlds. Play free with friends and discover which surprising details your room knows.
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Questions (40)
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1. What name is used for Mercury's shallow, irregular pits that often have bright edges?
medium- Hollows
- Impact basins
- Lava channels
- Scarps
2. Why does Mercury lack Earthlike seasons caused by a tilted axis?
medium- Its atmosphere is very thick
- Its axis tilts almost sideways
- Its clouds block all sunlight
- Its spin axis is almost upright
3. What change inside Mercury helped wrinkle its surface into long cliffs?
medium- Its forests expanded
- Its interior cooled and shrank
- Its oceans became deeper
- Its rings fell down
4. What kind of feature is Valles Marineris on Mars?
easy- A bright ring
- A huge canyon system
- A liquid ocean
- A tiny moon
5. Compared with Earth's, what is the atmosphere of Mars like?
easy- About as thick
- Completely absent
- Much thicker
- Much thinner
6. About how wide is Mars compared with Earth?
easy- About half as wide
- About ten times as wide
- About twice as wide
- Exactly as wide
7. Broad, flat volcanic domes on Venus are nicknamed after which food?
easy- Noodles
- Pancakes
- Pretzels
- Waffles
8. What shape best describes Mars's small moons Phobos and Deimos?
easy- Flat, like coins
- Long and straight, like pencils
- Perfectly round, like marbles
- Uneven, like potatoes
9. About how long does Phobos take to go around Mars once?
medium- Eight days
- Eight hours
- Eight months
- Eight years
10. Which of Mars's two moons orbits farther from the planet?
medium- Deimos
- Europa
- Phobos
- Titan
11. What covers the outside of Jupiter's moon Europa?
easy- A layer of solid iron
- A shell of water ice
- Liquid methane
- Loose volcanic ash
12. What marks many of the brighter regions on Ganymede's icy surface?
easy- Liquid methane lakes
- Long grooves and ridges
- Smooth dark lava plains
- Thick dune fields
13. Which description fits the surface of Jupiter's moon Callisto?
easy- Active lava flows everywhere
- Almost no impact craters
- Crowded with old impact craters
- Mostly open liquid seas
14. How many moons are in the classic group called Jupiter's Galilean moons?
medium- Eight
- Four
- Six
- Two
15. Which element helps give Io its colorful surface, including yellow areas?
medium- Copper
- Iron oxide
- Methane
- Sulfur
16. About how many Earth years does Saturn need for one trip around the Sun?
easy- 12
- 29
- 84
- Two
17. Which description best fits the tiny grains in the sand dunes on Saturn's moon Titan?
medium- They are grains of table salt
- They are pure iron
- They are rich in carbon
- They are tiny diamonds
18. Which food does Saturn's little moon Pan resemble in close-up pictures?
easy- A bunch of grapes
- A dumpling with a rim
- A long noodle
- A slice of toast
19. The bright white streaks on Saturn's moon Dione are mainly what?
easy- Cloud bands
- Frozen river channels
- Icy cliffs
- Volcanic ash streaks
20. Where does Iapetus wear a long ridge, a little like a seam around a ball?
easy- Along its equator
- Inside its core
- Only at its north pole
- Only at its south pole
21. What is unusual about the way Saturn's moon Hyperion turns?
hard- It always keeps one face toward Saturn
- It never rotates
- It tumbles irregularly
- It turns exactly once per Earth day
22. What do Saturn's moons Janus and Epimetheus do about every four years?
hard- Exchange inner and outer orbital paths
- Leave Saturn to orbit the Sun
- Merge into a single moon
- Reverse their direction around Saturn
23. What kind of landform is Ithaca Chasma on Saturn's moon Tethys?
medium- A chain of impact craters
- A frozen lake bed
- A long canyon
- A mountain ridge
24. Which of these planets is slightly wider across than Neptune?
easy- Earth
- Mars
- Mercury
- Uranus
25. What are the bright clumps in parts of Neptune's rings called?
medium- Arcs
- Belts
- Craters
- Zones
26. How does Triton orbit compared with Neptune's spin?
easy- Directly over its poles
- In alternating directions
- In the opposite direction
- In the same direction
27. Which gas may help power the fountain-like jets seen on Neptune's moon Triton?
medium- Argon
- Neon
- Nitrogen
- Oxygen
28. What do Uranus's inner rings look like?
easy- Narrow and dark
- Solid and green
- Thick and bright orange
- Wide and brilliant white
29. Which statement about the four giant planets is true?
easy- All four have rings
- None has rings
- Only one has rings
- Only two have rings
30. Compared with the sunlight it receives, Neptune gives off how much heat?
hard- Exactly the same amount
- Less heat
- More heat
- No heat at all
31. Counting outward from the Sun, which position does Uranus hold?
easy- Fifth
- Fourth
- Seventh
- Sixth
32. What was discovered around dwarf planet Haumea in 2017?
easy- A gas tail
- A liquid surface ocean
- A ring
- A thick atmosphere
33. Haumea spins once in roughly how much time?
medium- Four days
- Four hours
- Four months
- Four years
34. What color does faraway dwarf planet Makemake appear?
easy- Bright green
- Deep purple
- Pure blue
- Reddish brown
35. The moons Hi'iaka and Namaka orbit which dwarf planet?
hard- Ceres
- Eris
- Haumea
- Pluto
36. Which of these moons is wider across than dwarf planet Pluto?
easy- Charon
- Deimos
- Earth's Moon
- Pan
37. What frozen substance makes up much of Pluto's smooth plain Sputnik Planitia?
easy- Carbon dioxide ice
- Nitrogen ice
- Only methane ice
- Only water ice
38. What material forms the sturdy blocks of Pluto's tall mountains?
easy- Carbon dioxide ice
- Loose methane snow
- Nitrogen ice
- Water ice
39. What color is the striking north-polar cap on Charon?
easy- Blue
- Bright green
- Purple
- Reddish
40. Charon's diameter is about what fraction of Pluto's?
medium- One-half
- One-hundredth
- One-tenth
- Twice as large
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