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Seeking life on other worlds necessarily makes us examine our assumptions about the detectability of living things in extreme environments. We're learning that our own planet supports life in regions we once would have ruled out for survival, and as we examine such...

Although we've been focusing lately on photosynthesis, radiolysis -- the dissociation of molecules by ionizing radiation -- can produce food and energy for life below the surface and in deep oceans. Our interest in surface conditions thus needs to be complemented by...