How will humanity first discover ET Life? Best guess: Chemical signature from the interior of an icy moon Image of water plumes from Enceladus,taken by the NASA/ESA Cassini mission to Saturn We have already observed water ejected into space from the interior of Jupiter�s moon Europa and Saturn�s moon Enceladus. Biomarkers in this water will be strong evidence of life in the source oceans underneath the icy moons� crusts.

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