Inside Saturn's rings. Artist's impression of the interior of one of the rings of Saturn. Saturn's ring system is one of the marvels of the Solar System. There are seven rings around Saturn, extending to about 480,000 km radius. Each of the rings, with the exception of the outermost, diaphanous E ring, has a complex structure. Some of Saturn's moons perform the role of 'shepherds' to the rings, keeping them in a tight orbital position. Particles in the rings range from about 1cm diameter to a few metres.