Illustration of the Solar System comparing the size of the Sun (left) and its planets (right). Most of the mass of the Solar System is found in the Sun. The planets are arranged in their order from the Sun, but the distances are not to scale. From inner to outer, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The asteroid belt is shown between Mars and Jupiter. The inner four planets are rocky, the outer four are gas giants. The planets' moons and the rings of Saturn, Uranus and Neptune are also shown. The Sun's diameter (1.4 million kilometres) is around 109 times that of Earth and around 10 times that of Jupiter.