A giant impact can explain Uranus's 97.77-degree tilt and sideways moons, but a lost satellite and gravitational resonance offer a plausible rival history. Uranus is usually described as the planet that was knocked over. Its spin axis is tilted by 97.77 degrees relative to its orbit, so its equator is almost perpendicular to the plane in which the planet travels around the Sun. The popular explanation i... [7387 chars]
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