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The engineered structures and closed ecological systems designed to support space habitation. These are the "houses" and "towns" of the final frontier, ranging from hardened modules on other worlds to giant rotating cylinders in the void. A habitat isn't just a shelter; it's a full-life-support machine that must create a semblance of Earth-normal conditions—air, water, pressure, temperature, radiation shielding, and psychological space—in the most hostile environment known. The engineering goal is to build a bubble of biosphere that doesn’t pop.
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