36 Alien Civilizations In The Milky Way? The Science Behind A Ridiculous Headline

Intelligent aliens may be detectable from a variety of signals: electromagnetic, from planet modification, or because they’re spacefaring. But we haven’t found any evidence for an inhabited alien planet so far – we may truly be alone in the universe if we are alone, but the honest answer is we do not know enough about the relevant probability to say so.
Read more at Forbes…

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