Saturn, the mini solar system

It's been long known that Saturn and Jupiter have lots of moons. Both have rings, although Saturn's are obviously easier to see. Recently though it was found that Saturn also has its own asteroid belt, sort of.

http://saturn.jpl.nasa.gov/news/newsreleases/newsrelease20091006/

PASADENA, Calif. -- NASA's Spitzer Space Telescope has discovered an enormous ring around Saturn -- by far the largest of the giant planet's many rings. 

The new belt lies at the far reaches of the Saturnian system, with an orbit tilted 27 degrees from the main ring plane. The bulk of its material starts about six million kilometers (3.7 million miles) away from the planet and extends outward roughly another 12 million kilometers (7.4 million miles). One of Saturn's farthest moons, Phoebe, circles within the newfound ring, and is likely the source of its material.

Saturn's newest halo is thick, too -- its vertical height is about 20 times the diameter of the planet. It would take about one billion Earths stacked together to fill the ring.