| Only very few of the rings are formed by moons breaking up.
There are many different explanations for the formation of the rings, they are explained in the wikipedia article.
For example, the E ring was formed by volcanic eruptions from one of Saturn's moons. Read the article if you want more details of each of the rings.
Also, the speed that Starman has given is misguided. A simple understanding of orbital mechanics will tell you that the innermost (66,900km and orbiting at about 53,000mph) and outermost (483,000km and orbiting at about 20,000mph) rings must be moving at different speeds. |