From Sea to Shining Sea

The Cassini spacecraft has discovered a possible sea (left) that is as large as Lake Superior on the surface of Titan, the largest moon of Saturn. Cassini's radar, which penetrates a layer of haze atop Titan's atmosphere, had found several possible lakes during earlier encounters with Titan. It discovered this feature, which covers about 39,000 square miles, during its most recent flyby, in February. In Titan's extreme cold, its seas and lakes probably are filled with liquid methane. [NASA/JPL]