Comment by Asdfbla

Well, there's the simple fact (or what seems to be a fact at least, might not be true) that the reality of physics confines us to this rock, more or less. We don't travel faster than light, so at best we can achieve a Mars colony dependent on Earth supplies.

So yeah, I'd rather just focus on developing survival strategies for our rock. But the whole discussion is maybe a bit off topic here too.