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With a PoD after 1900, how early could we get large-scale interplanetary spaceflight? Supposing people generally supported it, what sort of scientific discoveries and technological development are necessary for it to be technologically and economically doable? And how can we get that public support?

The idea of rocket-powered spaceflight has been around since at least the mid-1800's, and Goddard did his experiments in the 1920's. With that, it's possible to just design the metals better and stack them taller, as America and Russia both did. If you do enough, that could get us to Mars... but not on an economically sustainable basis, so it'd probably be a prestige project like the OTL moonflights.

With a PoD after 1900, is there some way to break beyond that?
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