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 … Continue reading Something Twice the Size of Earth Slammed into Uranus and Knocked it Over on its Side