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Q&A What would the consequences be if there was a planet other than Earth, Venus, or Mars that was in the habitable zone?

Okay, there are two habitable worlds in the Solar System. One of them is Earth. Human history goes mainly the way it really went. Then, there is another planet with a sentient, equally advanced spe...

3 answers  ·  posted 9y ago by JDSweetBeat‭  ·  last activity 9y ago by JDSweetBeat‭

Question planets society alternate-history history