Maxwell has had the final word on the composition of the
rings; however, much fine detail has been discovered and many new
questions raised from information beamed back to Earth by
NASA’s Pioneer, Voyager, and Cassini spacecrafts.
Mimas, Enceladus, Tethys, Dione, Rhea, Titan, and Iapetus
are Saturn’s major moons. In addition to these and the
particles and aggregates of the rings, there are fifty-five
smaller moons and over a hundred and fifty moonlets.
See also in The book of science:
Readings on wikipedia: