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Q&A How would visible habited planets affect technology?

I have two binary pairs of planets in a planetary system. All of the planets are habitable, and similar in mass and composition to earth. Each pair is identical, or nearly so. The planets are tidal...

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

Question earth-like planets society earth