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The practice of designing, building, and testing the vehicles that carry humans and cargo beyond Earth's atmosphere, requiring a tolerance for risk that would be considered pathological in any other field. Spaceflight engineers must account for vacuum, radiation, extreme temperatures, and the fundamental hostility of the universe to human existence. They work with margins so thin that a single faulty O-ring can end a mission and lives. They then watch their creations launch, knowing that if they made a mistake, it will be very public and very final.
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