Alien life could be more difficult to find than some may think, according to a theory presented at a conference sponsored by the Royal Society. While planets with sustainable environments may exist, that may not mean alien life also exists, says Charles Cockell, director of the U.K. Center for Astrobiology at the University of Edinburgh. "It is dangerous to assume life is common across the universe. It encourages people to think that not finding signs of life is a 'failure,' when in fact it would tell us a lot about the origins of life," he said.
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