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Q&A How would an earth-like planet with a habitable moon work and how to get there?

I have a planet approximately 3.5 times the mass of the Earth. I have a moon orbiting that planet that has to be habitable as well, because my story will take place on the first expedition to this ...

5 answers  ·  posted 9y ago by JDSweetBeat‭  ·  last activity 7y ago by JDSweetBeat‭

Question planets physics gravity