Iapetus, and it's strange ridge.

Iapetus is one of Saturn's 33 kown moons, and this picture was taken by Cassini on New Year's Eve 2004. It looks a lot like Earth's own moon at first glance. However if you look close you will notice a ridge that runs across the center of the moon. I find this very intriguing, and it makes me wonder how it came about.

"On the left horizon, the peak of the ridge reaches at least 13 kilometers (8 miles) above the surrounding terrain." - NASA

So far Cassini has sent back some very interesting photos. I'm looking forward to more! Thanks to Moogah(moogah@gmail.com)for letting me know about this fascinating find.