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Rigorous Science How to quickly leave a planet for another planet en mass starting out from stone age tools?

An alien race decides to test the hability of humans to survive and engage into space travel, for whatever reason. The planets The aliens prepares a pair of Earth-like planets revolving around a ...

5 answers  ·  posted 8y ago by Victor Stafusa‭  ·  last activity 8y ago by Victor Stafusa‭

Question reality-check technology space-travel