The only planet that rotates on its side is Uranus. Unlike other planets in the solar system, which have more upright rotational axes, Uranus has an axial tilt of approximately 98 degrees, causing it to essentially roll along its orbit. This unique tilt gives Uranus extreme seasonal changes and unusual weather patterns. Additionally, its rotation period is about 17.24 hours. The planet is known for its faint rings and blue-green color, which results from the presence of methane in its atmosphere. The peculiar rotation and characteristics of Uranus make it one of the most intriguing planets to study in our solar system.