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Q&A At what minimal technological level would the inhabitants of a binary planet system need to be to communicate with each other effectively?

In the event that both planets of a binary planet system were life supporting, and both ended up developing a sapient, tool using species, at what technological level would they be able to start ef...

8 answers  ·  posted 7y ago by Zak‭  ·  last activity 6y ago by Zak‭

Question space planets aliens civilization technological-development