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Does Jupiter's moon Europa spin on its axis?

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Most moons in the solar system are tidally locked to their primary, meaning the same face is shown to the planet they revolve around at all times. They do spin, but at a rate equal to their rotational rate. read more

A leading explanation has been that Europa’s frozen outer shell might rotate slightly faster than the moon orbits Jupiter. If this out-of-sync rotation does occur, the same part of the ice shell would not always face Jupiter. read more

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