[jonathanlydall]

I read their "close enough" as in regards to similarity of climate/environment, not in regards physical distance of the other planet from Earth.

[shiroiuma]

I did too, but my point is that even if some planet is really "close" to Earth as far as climate, it doesn't matter because it's too far to get there.

I really think that it would be technically easier to just build a bunch of O'Neal cylinders here near Earth orbit, than to build ships capable of colonizing a distant planet.