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Relativity Space is changing how rockets are built—by using a giant 3-D printer, called Stargate, to create them. The system produces fully reusable rockets in just 60 days—compared with two years or longer for traditional aerospace companies—thanks to a streamlined manufacturing process leveraging autonomous robots and artificial intelligence. Early next year, the company will stage the first test launch of its Terran 1 rocket, which is designed to be used on resupply missions and to launch satellites. —Billy Perrigo

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