Astronomy › Section I · Giant planets, moons, and rings › Topic I.7
Planetary rings and Enceladus
All four giant planets have rings, but only Saturn's are bright enough to dazzle. Rings are swarms of tiny moons shaped by gravity, and one of Saturn's is fed by a small moon that sprays an ocean into space.
In this topic
- Four ring systems, very different
- Particles, not a solid disc
- Why rings sit close to their planets
- Worked example: Saturn's Roche limit
- The main rings of Saturn
- Moons that sculpt the rings
- Worked example: carving the Cassini Division
- Dark rings of Uranus and Neptune
- Enceladus: an ocean in space
- Common mistakes to avoid
- Key takeaways
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