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Uranus is the seventh planet from the Sun and is the third largest in the solar system. It was discovered by William Herschel in 1781. It has an equatorial diameter of 51,800 kilometers (32,190 miles) and orbits the Sun once every 84.01 Earth years. It has a mean distance from the Sun of 2.87 billion kilometers (1.78 billion miles). The length of a day on Uranus is 17 hours 14 minutes. Uranus has at least 22 moons. The two largest moons, Titania and Oberon, were discovered by William Herschel in 1787.

The atmosphere of Uranus is composed of 83% hydrogen, 15% helium, 2% methane and small amounts of acetylene and other hydrocarbons. Methane in the upper atmosphere absorbs red light, giving Uranus its blue-green color. The atmosphere is arranged into clouds running at constant latitudes, similar to the orientation of the more vivid latitudinal bands seen on Jupiter and Saturn. Winds at mid-latitudes on Uranus blow in the direction of the planet's rotation. These winds blow at velocities of 40 to 160 meters per second (90 to 360 miles per hour). Radio science experiments found winds of about 100 meters per second blowing in the opposite direction at the equator.

Uranus is distinguished by the fact that it is tipped on its side. Its unusual position is thought to be the result of a collision with a planet-sized body early in the solar system's history. Voyager 2 found that one of the most striking influences of this sideways position is its effect on the tail of the magnetic field, which is itself tilted 60 degrees from the planet's axis of rotation. The magnetotail was shown to be twisted by the planet's rotation into a long corkscrew shape behind the planet. The magnetic field source is unknown; the electrically conductive, super-pressurized ocean of water and ammonia once thought to lie between the core and the atmosphere now appears to be nonexistent. The magnetic fields of Earth and other planets are believed to arise from electrical currents produced in their molten cores.

Uranus Statistics
 Discovered byWilliam Herschel 
 Date of discovery1781 
 Mass (kg)8.686e+25 
 Mass (Earth = 1)1.4535e+01 
 Equatorial radius (km)25,559 
 Equatorial radius (Earth = 1)4.0074 
 Mean density (gm/cm^3)1.29 
 Mean distance from the Sun (km)2,870,990,000 
 Mean distance from the Sun (Earth = 1)19.1914 
 Rotational period (hours)-17.9 
 Orbital period (years)84.01 
 Mean orbital velocity (km/sec)6.81 
 Orbital eccentricity0.0461 
 Tilt of axis (degrees)97.86 
 Orbital inclination (degrees)0.774 
 Equatorial surface gravity (m/sec^2)7.77 
 Equatorial escape velocity (km/sec)21.30 
 Visual geometric albedo0.51 
 Magnitude (Vo)5.52 
 Mean cloud temperature-193°C 
 Atmospheric pressure (bars)1.2 
 Atmospheric composition

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