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The broad, catch-all category for any hardware that operates outside the comforting blanket of an atmosphere. This ranges from the mundane (improved space toilet designs, more efficient solar panels) to the critical (radiation-hardened computer chips, hypergolic thrusters) to the ambitious (orbital manufacturing stations, asteroid mining rigs). It's the foundational, "keep the humans alive and the data flowing" tech that makes everything else in space possible, emphasizing extreme reliability, lightweight materials, and systems that can't be fixed with a quick service call.
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