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Pollution Could Be Key to Finding Extraterrestrial Life

Looking for pollution in exoplanet atmospheres may be a promising way to detect intelligent life, according to new research.   Researchers at the Harvard-Smithsonian Center for Astrophysics (CfA) say they might soon be able to "spot the fingerprints of certain pollutants under ideal conditions."   "We consider industrial pollution as a sign of intelligent life, but perhaps civilizations more advanced than us, with their own SETI (search for extraterrestrial...

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