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Q&A In what kind of timeframe would there be interplanetary trade?

I have two binary planets, with technological level of about the present day. They've developed communication between the two planets, and scientists are trying to develop a method of getting peopl...

8 answers  ·  posted 8y ago by Xandar The Zenon‭  ·  last activity 8y ago by Xandar The Zenon‭

Question space travel planets spaceships space-travel economy ships