3 ms·
Fermi wasn’t talking about detection when he came up with the paradox. There was no SETI yet. He did a back of the napkin calculation that a civilization could
by goatlover 3y ago
Fermi wasn’t talking about detection when he came up with the paradox. There was no SETI yet. He did a back of the napkin calculation that a civilization could colonize the galaxy in 1 to 100 million years with sublight speeds. The galaxy is much older than 100 million years, so where is everyone? There’s been plenty of time for many civilizations to show up here.