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Q&A What if two planets orbited each other and also a star?

Say another Earth orbited the Earth, instead of the Moon. What effects would that have? Would gravity change in relation to the planets slightly during their orbits? I am world building and am tryi...

4 answers  ·  posted 9y ago by Chris‭  ·  last activity 5y ago by Chris‭

Question earth-like planets physics gravity orbital-mechanics earth