#455 – Adam Frank: Alien Civilizations and the Search for Extraterrestrial Life

3338.965 - 3359.996 Adam Frank

He'd done the calculation in his head and he suddenly realized that, look, if one, if they're, you know, if intelligence is common, that even traveling at sub light speeds, a, a civilization could cross, you know, kind of hop from one star system to the other and spread out across the entire galaxy in a few hundred thousand years. And he realized this. And so he was like, why aren't they here now?