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Q&A How long would it take to build a spaceship?

I'm working on a science fiction story which includes the following premise: Tony Stark invents an unobtainium reactionless engine, and the protagonists want to build a spaceship around it, big eno...

7 answers  ·  posted 7y ago by rwallace‭  ·  last activity 7y ago by rwallace‭

Question space spaceships ships engineering aircraft air