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Science quiz

Planets and their moons

Ten questions about moons, from the planets that have none to the biggest moon in the solar system.

Format
Pick the answer
Items
10 questions
Limit
None
Level
Medium
Checked
2026.10.03
Questions
10
Options
4 each
Time limit
None
  • Click an option, or press 1 to 4.
  • A short note follows every answer.
  • Enter moves to the next question.
  • Pause whenever you like (Esc). The board hides while the clock is stopped.

About this quiz

Moons are being discovered all the time, especially around the giant planets, so counts change. The answers here are the ones that do not.

  • Mercury and Venus are the only planets with no moons.
  • Ganymede is larger than the planet Mercury.
  • Phobos is slowly spiralling towards Mars.
  • Pluto, a dwarf planet, has five known moons; the largest is Charon.

Sources

  1. [1]NASA. Moons of our solar system.
  2. [2]NASA. Moons: facts.

Note on the data. Every answer was checked against NASA's moon pages on 3 October 2026. Questions avoid exact moon counts for the giant planets, which keep changing as new moons are confirmed.

Last checked October 3, 2026

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