# The largest moons in the Solar System

The Solar System's moons ranked by mean radius, from Wikipedia's list of Solar System objects by size. The diameter is roughly twice the radius.

- 1 vote · 19 items
- Oct 30, 2025 · gg.wandering
- https://even.best/en/l/624/the-largest-moons-in-the-solar-system

## Top 15

1. **Callisto** (1 · ▲1 ▼0) — Moon of Jupiter, mean radius about 2,410 km. Its surface is covered in craters.
2. **Ganymede** (0 · ▲0 ▼0) — Moon of Jupiter, mean radius about 2,632 km. The largest moon in the Solar System, bigger than Mercury.
3. **Titan** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 2,575 km. The only moon with a thick atmosphere, with lakes of liquid methane.
4. **Io** (0 · ▲0 ▼0) — Moon of Jupiter, mean radius about 1,824 km. The most volcanically active body in the Solar System.
5. **Moon** (0 · ▲0 ▼0) — Earth's natural satellite, mean radius about 1,737 km. The only other world humans have walked on.
6. **Europa** (0 · ▲0 ▼0) — Moon of Jupiter, mean radius about 1,561 km. Probably hides a liquid ocean under its ice.
7. **Triton** (0 · ▲0 ▼0) — Moon of Neptune, mean radius about 1,353 km. A large moon that orbits backwards, probably a captured object.
8. **Titania** (0 · ▲0 ▼0) — Moon of Uranus, mean radius about 788 km. The largest moon of Uranus.
9. **Rhea** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 764 km.
10. **Oberon** (0 · ▲0 ▼0) — Moon of Uranus, mean radius about 761 km.
11. **Iapetus** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 734 km. One half is dark and the other bright.
12. **Charon** (0 · ▲0 ▼0) — Moon of Pluto, mean radius about 606 km. About half the size of Pluto.
13. **Ariel** (0 · ▲0 ▼0) — Moon of Uranus, mean radius about 579 km.
14. **Dione** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 561 km.
15. **Tethys** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 531 km.
16. **Enceladus** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 252 km. Shoots plumes of water ice from its south pole.
17. **Miranda** (0 · ▲0 ▼0) — Moon of Uranus, mean radius about 236 km. Has Verona Rupes, a cliff around 20 km high.
18. **Proteus** (0 · ▲0 ▼0) — Moon of Neptune, mean radius about 210 km.
19. **Mimas** (0 · ▲0 ▼0) — Moon of Saturn, mean radius about 198 km. Its huge Herschel crater makes it look like the Death Star.

How is this ranking ordered? By people's votes: each ▲ adds a point and each ▼ takes one away. Anyone can vote and add what is missing.