Which planet rotates on its side and has a unique axial tilt?

Uranus is distinguished by its extreme axial tilt, which is approximately 98 degrees. This means that it essentially rotates on its side relative to its orbit around the Sun, creating a unique and unusual axial position compared to other planets in the solar system. This unusual tilt results in extreme seasonal variations, with each pole experiencing long periods of continuous sunlight followed by extended darkness as it orbits the Sun.

In contrast, other planets such as Jupiter, Neptune, and Saturn have more conventional axial tilts. For example, Jupiter's tilt is just about 3 degrees, making its rotation mostly upright relative to its orbital plane. Similarly, Neptune's axial tilt is around 28 degrees, and Saturn's is approximately 27 degrees. These more typical orientations do not lead to the pronounced seasonal effects seen on Uranus. Thus, Uranus stands out clearly as the planet with a unique rotation and axial tilt among the options provided.