Illustration showing Saturn (left) and Earth (right) to scale. Saturn is nine times the diameter of Earth. Saturn is the sixth planet from the Sun, Earth is the third. Saturn's rings consist of ice and dust particles. Saturn has the honor of being the second-largest planet in the Solar System, though it has only 30% the mass of its jovian better Jupiter. Saturn is blanketed by thick clouds and is believed to have no solid surface except for a relatively small, Earth-size core of rock and metals.