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Advanced Alien Civilizations Still Science Fiction For Now

A wide-ranging search of faraway galaxies has turned up no obvious signs of advanced alien civilizations.

A team of scientists dug through observations made by NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft, hunting for telltale heat signatures coming from 100,000 galaxies— a strategy suggested by theoretical physicist Freeman Dyson back in the 1960s.

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