There Are 4 ‘Malicious Extraterrestrial Civilizations’ in Milky Way, Researcher Estimates

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There Are 4 ‘Malicious Extraterrestrial Civilizations’ in Milky Way, Researcher Estimates
There Are 4 ‘Malicious Extraterrestrial Civilizations’ in Milky Way, Researcher Estimates submitted by /u/TheExoplanetsChannel
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