The Cassini spacecraft sent beautiful images of Saturn rings.

© NASA/JPL/University of Colorado

As NASA explains:
"Our ideas about the rings have been expanded tremendously," said Dr. Linda Spilker, deputy project scientist for the Cassini-Huygens mission, NASA's Jet Propulsion Laboratory, Pasadena Calif.
Only a week into the international Cassini-Huygens mission, new findings are already changing what we know about Saturn, its majestic rings, magnetosphere and many moons. Those discoveries include a mysterious material dubbed "dirt" in the gaps between Saturn's rings, a ringside cloud of escaping oxygen, and a puzzling picture of the surface and atmosphere of the planet's largest moon, Titan.

In a very interesting article, Slate journalist Brendan I. Koerner explains why Saturn has rings and we don't. As M. Spock would say "fascinating" :-)

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