Which planet is tilted on its side, causing its unique rotation?

Uranus is unique among the planets in the solar system due to its extreme axial tilt of about 98 degrees. This means that it rotates almost perpendicular to its orbit around the Sun, resembling a rolling ball. As a result, the poles of Uranus experience extreme variations in sunlight during its long seasons, which can last for over 20 years.

This unusual orientation affects the planet's weather patterns, atmospheric circulation, and seasonal changes. Because of its tilt, Uranus's rotation set it apart from the more typical rotational orientations of other planets, where the axial tilt is relatively small.

Other planets such as Earth, Venus, and Mars have tilt angles that result in more conventional axial positions, which lead to more standard patterns of seasonal changes and rotation. While Venus has a retrograde rotation and Mars has a tilt that gives it seasonal variations, neither has the dramatic tilt that Uranus does, which defines its unique rotation.