Most of the rings have a prograde orbit, in the same direction as Saturn, but the outermost (the Phoebe ring) is thought to originate from Phoebe, the largest of Saturn's irregular moons—and ...

Composed of chunks of ice and rocks of varying sizes, these ring systems are maintained by small shepherding moons, whose gravitational forces tug the chunks and tweak their positions. These ...

For example, ring particles — the tiny fragments of ... circular orbits close to the equator of their host planet; and irregular moons, which can be much smaller and have larger, more elliptical ...