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EVERY planet? Well, every one we've examined closely. There are a couple of thousand "exoplanets" that orbit other stars; we know scarcely more about those other than that they exist.

It's highly likely that MOST planets have a revolution; they orbit their parent stars. But while we have not actually discovered any "free planets", what we know of cosmology suggests that there probably are a few "free" planets that do not orbit any star.

From a strictly physics and engineering standpoint, I can say that it's highly likely that every planet rotates. The idea of a planetary body without at least a LITTLE bit of spin is quite unlikely.

But in a galaxy with nearly a trillion stars and probably even more planets, there may be a few that don't rotate.

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9y ago

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