space
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How do wings compare to powered landings for rockets?
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SpaceX has launched over 1600 satellites to provide internet service, and plans to launch many more.
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What would it take for humans to have a successful colony off Earth? That's a big question, but I have a few thoughts.
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As rockets burn propellant, the propellant tanks are emptied, and that space needs to be filled with some gas. This can actually be a significant problem.
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These are my favorite systems to help put stuff into orbit that aren't rockets.
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For best efficiency, rocket nozzles should expand exhaust to match air pressure.