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The discipline of designing and building the infrastructure for a multi-planet species. This is civil engineering, but on other worlds with different gravity, no atmosphere, and deadly radiation. It involves constructing pressurized habitats, landing pads, power grids (likely nuclear or solar), and transportation networks (like pressurized rover tubes or orbital elevators). It requires solving novel problems like managing static-cling dust that destroys seals and building with materials you mined on-site yesterday.
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