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Why does Venus have a retro-grade rotation?
Question Date: 1998-03-09
Answer 1:

I read one book that suggested that maybe Venus used to be a comet that got trapped in the gravitational field of the Sun, but I don't think many people buy that one.

Answer 2:

I don't think anyone can say for sure.Probably something happened to change its rotation. What kinds of things could you imagine happening that could do such a thing?

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