Dr. Christopher McKay speculates we may already have evidence of life on Saturn's moon Titan.
As the Huygens probe was about to land on Titan, he argued methane-based life might consume hydrogen. In fact, Huygens found plenty of hydrogen in the upper and middle layers of Titan's atmosphere, but a diminished amount in the lower layer, where life would presumably be.
The idea needs more work, as McKay acknowledges, but it's sure provocative.
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