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So, maybe we are alone after all.
The number of planets in the universe that could sustain alien life is much smaller than had been thought, astronomers announced this week in a new study.
“Imagine a habitable zone for complex life defined as a ‘safe zone’ where it would be plausible to support rich ecosystems like we find on Earth today,” said study co-author Timothy Lyons, a biogeochemist at the University of California–Riverside. “Our results indicate that complex ecosystems like ours cannot exist in most regions of the habitable zone as traditionally defined.”
What’s the problem? It turns out that a buildup of toxic gases in the atmospheres of most planets makes them unfit for complex life as we know it, the study said.
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James' World 2 
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