Let's start with a self-sustainable colony at the South Pole. Or, for that matter, a self-sustainable colony in Death Valley. "But even if we could, why would

Let's start with a self-sustainable colony at the South Pole. Or, for that matter, a self-sustainable colony in Death Valley. "But even if we could, why would anyone want to?" you might ask... And that's the point. Nobody would want to as there is no economic reason to be there. My two cents: we'll never colonize a moon or planet. There are, on the other hand, some economic perks to manufacturing in zero-g. Consequently, I'd put my money in massive orbiting space stations.