Rings are swarms of tiny
moons orbiting according
to Kepler’s laws.
Moons maintain sharp
ring edges and create
gaps in the rings.
Particles in dense rings
must move in circular
orbits and travel in unison
with nearby particles.
The mass of all Saturn’s
bright rings is less than the
mass of a small icy moon.
Rings can be distorted by
the gravitational influence
of nearby moons