The first-ever image of a massive river system on another world

This image was taken by the space probe Cassini, and shows what appears to be a massive river system on Saturn's moon Titan. The European Space Agency reports that it flows 400 km across the cloudy moon's surface, where it meets a large sea. This is most likely a river made of liquid ethane or methane, not water.… » 12/12/12 12:10pm 12/12/12 12:10pm