AP Photo

The Cassini Solstice mission has discovered what appears to be a miniature version* of the Nile River on Saturn's largest moon, Titan. The 400 kilometer (250 mile) long feature -- from 'headwaters' to a large sea -- is the longest extraterrestrial river ever to be discovered and imaged to such high resolution.

Using Cassini's radar imaging instruments, mission scientists were able to deduce that the feature is indeed a river as the dark, smooth surface within the meanders and channel suggest the presence of a liquid.