Titan's 'Great Lake'

The Cassini orbiter has recently found evidence of giant lakes on Saturn's mysterious moon, Titan. Plus, new photos from the high-resolution camera orbiting Mars show evidence of water erosion and give a new, animated look at the Mars rovers.

Scientists believe that several dark features near Titan's north pole are lakes that are most likely filled with liquid gases, ethane or methane. The two gases are the primary components of what Earthlings call natural gas. One lake appears to be bigger than the largest of the Great Lakes on Earth, Lake Superior.