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Q&A How small in diameter a planet can be while retaining most of Earth's properties?

Suppose that I have a planet very similar to Earth. It has the same level of gravity, water-land ratio, temperature, air composition, rotation and revolution speed, tectonic activities, temperature...

2 answers  ·  posted 8y ago by 絢瀬絵里‭  ·  last activity 5y ago by 絢瀬絵里‭

Question earth-like reality-check planets earth