The big question "are we alone in this universe" has been a driving force with NASA for many years. Mars and before that Venus were all predicted to have some sort of primitive life even up to the early 1950's.
It seems the more knowledgeable we become of our solar system and the universe, the more "alone" we seem to be.
NASA have said the search for life is the search for water.
They believe that these moons (Europa and to a point Enceladus) may harness the precious liquid under the ice.
After all these years NASA still amazes me.
Edited by Major Payne, 17 December 2012 - 03:13 AM.