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The practice of designing systems where the primary constraints are cosmic distance, timescales longer than human civilization, and survival in the total vacuum of deep space. It's engineering with a multi-generational perspective: building ships that must self-repair for a thousand years, creating robust AI to guide missions where no help can be sent, and developing manufacturing that can use unknown resources at the destination. It's as much about sociology and ethics (designing societies for a generation ship) as it is about metallurgy and plasma physics.
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