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Why haven’t we found aliens? A physicist shares the most popular theories. | Brian Cox
Become a Big Think member to unlock expert classes, premium print issues, exclusive events and more: https://bigthink.com/membership/?utm_source=youtube&utm_medium=social&utm_campaign=yt_desc Chances are, we’re not alone in the universe. But if that’s true — why can’t we seem to find our neighbors? This question is known as the Fermi ...
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