Uranus has a very peculiar orbit, unique in the solar system. The planet is tilted in such a way that its poles face the Sun directly, so that Uranus spins from top to bottom. It acts like a cylinder that is rotating on its ends instead of rotating on its sides. Scientists believe that another planet-like object might have crashed into Uranus, knocking it over on to its side. The long seasons are caused by the planet’s unusual orbit.