Comment von Neumann probes (Score 4, Insightful) 391
A real head-scratching conundrum about the universe is explaining why it's not already overrun with self-replicating robots. Because if it's possible to send self-replicating interstellar probes, all it takes is one launch, plus a few million years, to get the galaxy overrun with them. So are they not possible? nobody's launched one yet? here, but not detected? The implications boggle the mind.