Physics of Saturn
Saturn is the sixth planet from the sun, and the second largest in the solar system. Saturn's most distinctive feature is it's ring system. The rings are named in order of their discovery, and from the planet outward they are know as the D,C.B.A.F.G. and E rings. These rings are now know to comprise more than 100,000 individual ringlets, each of which circle the planet. The other special feature is that saturn (as well as jupiter) is still settling gravitationally, following it's original accretion from the gas and dust nebula from which the solar system was formed more than 4 billion years ago. This contraction generates heat, causing Saturn to radiate into space three times as much heat as it receives from the sun.
http://www.oulu.fi/~spaceweb/textbook/saturn.html
