Scientists have proposed to a send boat-like floating probe to land on the lakes of Saturn's moon Titan.

Titan, the largest of more than 60 natural satellites that orbit Saturn, is covered in seas, lakes and rivers composed of methane. It has a dense, nitrogen-based atmosphere, and is described as one of the most Earth-like bodies in the solar system.

Bodies of water ... a radar image of Titan taken by NASA's Cassini spacecraft.

Many scientists believe that Titan may be able to support life, due to its liquid seas and insulating atmosphere. Others doubt this due to its freezing average temperature of minus 178 degrees, but a more hospitable sub-surface ocean may also exist on the moon.