Something Twice the Size of Earth Slammed into Uranus and Knocked it Over on its Side
Astronomers think they know how Uranus got flipped onto its side. According to detailed computer simulations, a body about twice the size of Earth slammed into Uranus between 3 to 4 billion years ago. The impact created an oddity in our Solar System: the only planet that rotates on its side. A study explaining these …
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