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One of the biggest challenges of space travel has very little to do with the traveling itself, and more to do with everything that happens afterward. How will humans sustain themselves if we send them back to the moon (and, as planned, to Mars)? Food, even freeze-dried, is heavy. Water, too. Maintenance is expensive, in every sense of the word. So if manned space travel is to become a long-term reality, we'll need to find ways to cultivate the places and planets we visit: to mine their soil for nutrients, to find the water hidden in their depths, to generate the air that will make everything else possible.