PBS Space Time
What If Humanity Is Among The First Spacefaring Civilizations?
2022 E30 Nov 8, 2022 21m
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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