The only planet in our solar system that rotates on its side is Uranus. This unique axial tilt, which is about 98 degrees, means that Uranus essentially rolls along its orbital path. As a result, its poles experience extreme variations in sunlight during its 84-year orbit around the Sun, contributing to dramatic seasonal changes. This peculiar rotation is likely a result of collisions with other celestial bodies early in the history of the solar system. Uranus is also known for its striking blue color, attributed to methane gas in its atmosphere.