PBS Space Time
What If Humanity Is Among The First Spacefaring Civilizations?
2022 • E30 Nov 9, 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.
