The rings of Saturn is the name of the rings around the planet Saturn. They consist of many small particles, ranging in size from microscopic to the size of a bus (or bigger) that form clumps that in turn move around Saturn. The particles in the rings are made almost entirely of water ice, with just a small amount of dust and other chemicals. There are some gaps in the rings. The moon Pan causes the gap called the "Encke gap" in Saturn's A ring. The Cassini Division, discovered by Giovanni Domenico Cassini, is a gap between the A ring and the B ring.