"How weird do they have to be to suggest a second genesis as opposed to just an obscure branch of the family tree?" he said. Davies suggested that the only way to prove an organism wasn't "life as we know it" was if it were built using exotic elements which no other form of life had.
Such organisms have yet to be found. Bruce Jakosky, an astrobiologist at the University of Colorado at Boulder, said the notion of alien life on Earth was "an interesting theoretical idea" but one that would be impossible to put odds on because "we have no idea what we're looking for."
And is there altruism in the universe?
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