In-space manufacturing

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The proposition that some products are better made in orbit than on Earth, and the small set of demonstrations that have actually tested it. The physical argument is real: without buoyancy-driven convection and sedimentation, crystals can grow more uniformly, immiscible materials can be alloyed, and fluids behave differently — effects long documented in microgravity research. The economic argument is far narrower, because a product must be worth more per kilogram than the cost of lifting its inputs, operating in orbit and bringing it home. Only a few candidate classes clear that bar: pharmaceutical crystallisation, specialist optical fibre such as ZBLAN, semiconductor substrates, and biological tissue. The concrete milestone came in February 2024, when Varda Space Industries returned a free-flying capsule to the Utah Test and Training Range carrying crystals of the antiviral drug ritonavir grown in orbit — the first commercial manufacturing product returned from space by a private company, and notable as much for the fact that its return was delayed by re-entry licensing as for the chemistry. What has not been shown is that any of it is cheaper than the terrestrial alternative at production volume. Not a place.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.