Link to Wonders of the solar system: 5- Aliens documentary
Documentary Description
Brian Cox considers how the building blocks of life might be found on
other planets by studying the required element that is most abundant on
Earth - water. He descends to the bottom of the Pacific to discover the
creatures that have evolved in this most alien of environments, and
flies above the American Scablands to see the effect of the geological
changes wrought by water in exactly the circumstances astronomers
believe occurred on Mars