WHY is the axis of Uranus “horizontal”?

Unlike the other planets of the solar system, Uranus “lies on its side” relative to the plane of orbit around the Sun. If the Earth is commonly compared to a spinning, slightly inclined wolf, which moves around the Sun, the movement of Uranus resembles that of a rolling orbital ball.

The reasons for this position of the axis of Uranus remain unknown, but the main hypothesis suggests that during the formation of the solar system (3-4 billion years ago) Uranus collided with a protoplanet the size of the Earth, which led to a change in the tilt of the axis of Uranus.

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