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Color image of the icy surface of Europa showing spots and pits that could be signs of a hidden ocean.
Reddish spots and shallow pits pepper the ridged surface of Jupiter's moon, Europa. The icy surface of Jupiter's Europa may hide a global ocean -- a potential harbor for life.
Discuss the expanding definition of life and the places it may exist beyond Earth.

Activities in this area focus on how explorers identify the characteristics needed for life to exist and use that definition to guide the search for life beyond Earth.

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Last Updated: 9 Jun 2010