• It depends. If the ring rotates about a planet with a significant gravitational pull, rings form wherever stray material is far enough away to keep from colliding with he planet's atmosphere, but close enough that the material cannot coalesce into coherent moons (due to extreme tidal forces, i.e. variation in the gravitational field over the would-be surface of the would-be moon). Or, it could mean that another planet liked the planet enough to give it a ring as a promise to someday marry it.
  • I think Saturn is the only planet with rings around it. I can't remember how they got there or what they are for.
    • bostjan64
      Jupiter, Uranus, and Neptune have rings as well, but Saturn has the best rings. You can see Saturn's rings with binoculars or even with the naked eye on a good night. To see the rings of Jupiter or Uranus, you'll need a nice amateur telescope. Some of the minor planets (for example, Haumea, a dwarf planet similar to Pluto, has its own rings) have one or more rings as well, but you probably wouldn't be able to see them from Earth, even with the biggest telescopes, because they are so faint.
  • Those dirty rings! You try washing them out, scrubbing them out and you still end up with Ring Around the Planet!

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