Uranus (Courtesy to Microsoft Encarta for this photograph.)

Uranus revolves around outside of the orbit of Saturn and inside the orbit of Neptune. Uranus has an inner rocky core that is surrounded by a wide ocean of water mixed with rocky material. From the core, this ocean extends up until it meets an atmosphere of hydrogen, helium, and methane. Uranus has 10 rings and 18 moons. It also has three other bodies that were just discovered in 1999, and these bodies may be moons. The mass of Uranus is 14.5 times greater than the mass of Earth. Its volume is 67 times greater than Earth's volume. The force of gravity on the surface of Uranus is 1.17 times the force of gravity on Earth. Scientists classify Uranus as one of the giant or Jovian planets along with Jupiter, Saturn, and Neptune.

Uranus is mostly composed out of rock and water with hydrogen and helium making up its atmosphere. Some scientists believe that Uranus was formed out of comets colliding with each other. As Uranus started to grow, the pressures and temperatures in the Uranus' interior increased, heating Uranus' comets into a hot liquid. Frozen water and rock also forms most of Uranus' moons. Most of Uranus' volume is water, and scientists think this ocean consists mostly of water molecules, which are mixed with silicate, magnesium, nitrogen-bearing molecules, and hydrocarbons. Uranus's ocean is very hot. It is about 6,650° C (12,000° F). The atmosphere of Uranus, which contains hydrogen, helium, and a little methane, extends 5,000 km. (3100 mi) above its ocean.