From PBS Space Time.
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Half of the universe is filled with expansionist alien civilizations, and it’s only a matter of time before they’ll reach us. OK, that sounded a little sensationalist. But it’s also the conclusion of a recent astrophysics paper. Let’s see how they figure this, and whether we should take it seriously.
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Hosted by Matt O’Dowd
Written by Euan McLean & Matt O’Dowd
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