Animation showing the relative sizes of the Earth and Uranus. Earth has a diameter of some 12,742 kilometres, making it the largest of the rocky terrestrial planets. Uranus is an ice giant, four times Earth磗 width, with a diameter of 51,120 km. Uranus has a thin ring system composed of dark particles. Uranus orbits the Sun at a distance of some three billion kilometres, twenty times the Earth_Sun distance.