The most efficient way to colonize space is with self replicating robots/factories. Human settlement is probably going to be more of an afterthought, or along the lines of on-site repair and teleoperations personnel for the robots doing the heavy lifting. The concept of slave labor in orbital mining colonies doesn't make much sense outside of science fiction.
Once a certain critical mass has been reached in terms of having systems that can convert raw space materials (asteroids, lunar regolith, and so on) to more useful configurations of their raw elements ...
Nope, the Moon has none of the resources required for sustaining a spacefaring civilization, except sunlight and water. Whatever resources you have will degrade with inefficiencies and damage. Your only hope is to just wait for however many years or millennia it takes for Earth to become habitable again and then jump back in a prepackaged spacecraft. But, as noted above, it's vastly easier to just do this in a shelter on Earth.
You are forgetting the rocks, including metals and so forth that we know to be present there (and on the asteroids, which are an...
I'm with you on spinoffs argument, however we're concerned with technologies of ... (read more)