Well, okay. But by that logic we won't go to other planets unless we have a pressing need, so the whole argument is moot.
Like I said, if your interest is preserving the human race you can can get a lot more bang for your buck by digging into the earth. No matter what's going on at the surface at least you'll have the kind of gravity humans physiology has evolved to expect.
Sure, if your worry is elbow room. But when people say we don't want to "put all our eggs in one basket" they're typically including things like nuclear war, killer asteroids, and gamma ray bursts.
Yeah, I was referring more to the eggs/basket issue. Beyond that, though, I think there's a lot more to be gained from colonizing worlds than digging into the earth. One is pushing outward, the other is retreating inward, and is very much a dead end.
Like I said, if your interest is preserving the human race you can can get a lot more bang for your buck by digging into the earth. No matter what's going on at the surface at least you'll have the kind of gravity humans physiology has evolved to expect.