In this photo taken by Cassini in May 2010, the moon Titan looms behind Saturn's rings. Titan is hefty moon--in fact, it's almost as large as the planet Mars.

Its thick atmosphere made it impossible for previous spacecraft to capture images of its surface, but Cassini's camera is capable of seeing through the haze. These photos show a landscape marked by mountains, lakes, dunes, and canyons carved by flowing liquids. Still, even with this knowledge, there is much to learn about how the geology and atmosphere of this monstrous moon.

Some researchers think that Titan, with its thick atmosphere and lakes of liquid methane, is the likeliest spot to find extraterrestrial life in our solar system. While Cassini continues to send back tantalizing suggestions of life on the moon, the big question won't be answered any time soon.