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Q&A Rigorous Science Meta
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Rigorous Science Could Earth and the Moon be the same size?

Many questions on this site hypothesize about two planets in close orbit of each other, each developing their own civilizations. How feasible is that? Some 4.5 billion years ago Theia, a planetary...

4 answers  ·  posted 7y ago by kingledion‭  ·  last activity 6y ago by kingledion‭

Question planets orbital-mechanics