I wouldn’t give up hope on space-faring aliens inside our own galaxy—but the argument still holds pretty well down to c/1,000. Those are some pretty slow-moving aliens. One begins to wonder why they would think they can dawdle around.
I wouldn’t give up hope on space-faring aliens inside our own galaxy—but the argument still holds pretty well down to c/1,000. Those are some pretty slow-moving aliens. One begins to wonder why they would think they can dawdle around.