Uranus isn't just gassy, it's also tilted completely sideways, such that instead of rotating like a spinning top, it rolls around the plane of the solar system more like a giant ball. Now astronomers think they know how this happened, and it means that Uranus has been pounded really, really hard not once, but twice.
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Uranus takes a pounding more frequently than thought | DVICE
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Uranus takes a pounding more frequently than thought | DVICE