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The discipline of building structures and systems in and with space itself, using the unique environment as both a tool and a construction site. This includes building orbital habitats, solar power satellites, asteroid mining infrastructure, and interstellar probes. But advanced space engineering involves megastructures: O'Neill cylinders, Bernal spheres, Stellar Engines (like the Shkadov thruster to move a star), and astro-engineering projects that use the raw materials of star systems without planets as their primary substrate. It's construction where the vacuum, microgravity, and abundant solar energy are core design features.
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