Page last updated at 14:54 GMT, Saturday, 20 March 2010

How Saturn's moon Titan maintains its atmosphere


Professor Brian Cox demonstrates how worlds, even small ones, can hang on to an atmosphere.

The series presenter of BBC Two's Wonders of the Solar System describes how Saturn's moon, Titan, holds a striking resemblance to Earth.

Wonders of the Solar System, presented by Professor Brian Cox, continues on BBC Two on Sunday (2100 GMT).


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