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The reason that people are focused on 'life like us' is that H2O is extremely abundant, and environments where liquid ANYTHING is possible are relatively rare. So life elsewhere likely uses water. that's what we mean by 'life like us.' we know of no example of life that does not use water. On the other hand, researchers are starting to think about 'weird life' (that's really what its called) that uses things other than DNA and water, so don't fret, we will not miss Carl Sagan's famous silicon-based giraffe when it walks by.
Permalink Tue, 22 Sep 2009 21:31:00 UTC | #399986