Science quiz
Major moons of the solar system
Twenty three famous moons, boxed by the world they orbit. Type a moon and it lands in the right box.
- Format
- Type them all
- Items
- 23 answers
- Limit
- 5:00
- Level
- Hard
- Checked
- 2026.10.03
- Answers
- 23
- Time limit
- 5:00
- Order
- Any order
- Matching
- Case and accents ignored
- Type an answer; it files itself the moment it matches.
- One answer can fill several slots.
- Give up at any time to see what you missed.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Name the major moons of each world.
Earth0/1
- 1Not found yet
Mars0/2
- 1Not found yet
- 2Not found yet
Jupiter0/4
- 1Not found yet
- 2Not found yet
- 3Not found yet
- 4Not found yet
Saturn0/7
- 1Not found yet
- 2Not found yet
- 3Not found yet
- 4Not found yet
- 5Not found yet
- 6Not found yet
- 7Not found yet
Uranus0/5
- 1Not found yet
- 2Not found yet
- 3Not found yet
- 4Not found yet
- 5Not found yet
Neptune0/3
- 1Not found yet
- 2Not found yet
- 3Not found yet
Pluto0/1
- 1Not found yet
About this quiz
The giant planets have dozens of moons each, most of them small. These are the big or famous ones, plus the moons of Earth and Mars and Pluto's Charon.
- Io, Europa, Ganymede and Callisto are the Galilean moons, found by Galileo in 1610.
- Ganymede is the largest moon in the solar system, bigger than the planet Mercury.
- Triton was discovered just 17 days after Neptune itself, in October 1846.
- The moons of Uranus are named after characters from Shakespeare and Alexander Pope.
Sources
- [1]NASA. Jupiter moons.
- [2]NASA. Saturn moons.
- [3]NASA. Uranus moons.
- [4]NASA. Neptune moons.
- [5]NASA. Moons of our solar system.
Note on the data. Each moon and the world it orbits was checked against NASA's moon pages on 3 October 2026. The selection is ours: the Galilean moons, seven large moons of Saturn, the five major moons of Uranus, three moons of Neptune, and the moons of Earth, Mars and Pluto's Charon. Total moon counts are left out because they keep changing.
Last checked October 3, 2026
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | Which planet does this moon orbit? Sort the moons Io, Titan, Triton, Charon: 23 major moons of the solar system, one at a time. Click the world each moon orbits. Two tries per moon. Science / Sort into groups / 23 to sort | Science | Sort into groups | 23 | 2026.10.03 |
| 02 | Planets and their moons Ten questions on the moons of the solar system: which planets have none, how many Mars has, and which moon is the largest of all. Science / Pick the answer / 10 questions | Science | Pick the answer | 10 | 2026.10.03 |
| 03 | Planet, dwarf planet or moon? Triton, Makemake, Titania, Ceres: 34 worlds of the solar system, one at a time. Is it a planet, a dwarf planet or a moon? Click the right box. Science / Sort into groups / 34 to sort | Science | Sort into groups | 34 | 2026.10.03 |