Mercury rotates so slow that a day it longer than a year. Venus rotates backwards. Mars has our solar system's biggest mountain, Olympus Mons. Jupiter is the one with the Great Red Spot, which is actually a storm. Saturn's rings are made up of the debris from two moons that collided. Uranus has the funniest name. Neptune has the most violent storms in our solar system and PLUTO IS A FREAKIN' PLANET!