The third largest planet in the Solar System, and the seventh planet from the Sun.

• Uranus was discovered in 1781 by astronomer William Herschel
• Four times bigger than the Earth
• The only planet to spin on its side
• This seventh planet from the Sun is so distant that it takes 84 years to complete an orbit.
• Uranus is classified as a "gas giant" planet because it has no solid surface. The atmosphere of Uranus is hydrogen and helium, with a small amount of methane and traces of water and ammonia. The bulk (80 percent or more) of the mass of Uranus is contained in an extended liquid core consisting primarily of "icy" materials (water, methane, and ammonia), with higher-density material at depth.
  
  

  Orbit: 2,870,990,000 km (19.218 AU) from Sun Diameter: 51,118 km (equatorial) Mass: 8.683e25 kg

  
  NUMBER OF MOONS - 21+
  
  MAIN MOONS: Oberon,Titania,Umbriel,Ariel,Miranda
  
  Oberon - Oberon is of the larger moons of the planet Uranus.
  
  Titania - Titania is the largest of Uranus's moons.
  
  Umbriel - Umbriel is a moon that orbits the planet Uranus.
  
  Ariel - Ariel is one of the larger moons that orbit the planet Uranus.
  
  Miranda - A small moon that orbits the planet Uranus.