How do the rings of Saturn stay separated?

Saturn’s rings are made mostly of water ice particles ranging from tiny grains to boulders. The rings are not solid; each particle orbits Saturn independently. Gravity from nearby moons and orbital resonances help keep some rings narrow and carve famous gaps, such as the Cassini Division. Shepherd moons can confine ring edges by repeatedly tugging on particles. The rings are also surprisingly thin compared with their enormous width, which is why they can look like a broad disc from a distance.