How Asteroid Mining Could Pay for Our First Space Colony

Many of us dream of living on other planets, but are two things we'll need before it can actually happen: money and raw materials. Now some companies say they have a solution to this problem. They'll mine asteroids for valuable metal ores, and for basic resources like water that we'll need once we're far from Earth. » 2/17/15 4:56pm 2/17/15 4:56pm