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Q&A What phenomenon (gravitational?) in space would allow the transfer of humans rapidly between two planets or system-wide?

So what I'm looking for is some plausible idea of two human planets, orbiting each other closely, that despite having regressed to a medieval homage, were capable in this old era of powering solar ...

3 answers  ·  posted 5y ago by Naga‭  ·  last activity 5y ago by Naga‭

Question space travel planets gravity space-travel solar-sails