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Q&A What determines the length of a day on a planet?

The length of a day on different planets in the solar system varies a lot. For instance, Mars' day is about the same length as Earth, while a day on Venus is equivalent to 243 Earth days (source). ...

3 answers  ·  posted 10y ago by JessWelch‭  ·  last activity 5y ago by JessWelch‭

Question astronomy planets