The planet known for having a sideways rotation is Uranus. This unique rotation sets Uranus apart from other planets in the Solar System, as it is tilted at an angle of about 98 degrees relative to its orbital plane. Because of this extreme tilt, Uranus rotates on its side, causing its poles to experience prolonged sunlight and darkness throughout its 84-year orbit around the Sun. This unusual axial tilt leads to extreme seasonal variations in temperature and sunlight. Uranus is an ice giant, composed mostly of water, ammonia, and methane. Its atmosphere is known for its striking blue-green color due to methane absorbing red light.