Tuesday, October 16, 2012

The problem with "life is universal"

"Panspermia" is the name of a hypothesis that living organisms have traveled, and still do,  "between planets and even between star systems." But not so fast
But the problem, and the potential paradox, is that if evolved galactic panspermia is real it’ll be capable of living  just about everywhere. There should be stuff on the Moon, Mars, Europa, Ganymede, Titan, Enceladus, even minor planets and cometary nuclei. Every icy nook and cranny in our solar system should be a veritable paradise for these ultra-tough lifeforms, honed by natural selection to make the most of appalling conditions. So if galactic panspermia exists why haven’t we noticed it yet?
And so the Fermi Paradox still goes unanswered.

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