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The actual practice of constructing megastructures and manipulating celestial bodies. It's the applied version of Kardashevian Mechanics, involving timelines of millennia, workforces of self-replicating machines, and a tolerance for risk that includes "if we fail, we might accidentally cause a supernova." This engineering discipline deals with project management where the worksite is light-years across and the building materials are asteroids, comets, and starlight.
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