We now know that each of the gas giant planets of our solar system has a ring system of one sort or another. Saturn’s is easier to see than the others because its individual particles consist of relatively clean water ice. Jupiter’s ring is essentially a ring of smoke. Uranus’ and Neptune’s are very dirty ice. Rings are thought to exist around planets when an errant moon is shattered by collision inside the Roche Limit. Every one of these rings systems is kept in line by shepherd moons or shepherding satellites. These small moons exert gravitational forces on escaping rings particles. Here’s a short video with some more details. Watch shepherd moons as they go around here. We have named the parts of each of these ring systems.