Uranus - NASA

National Aeronautics and Space AdministrationNational Aeronautics and Space Administration2001 2002 2003 2004 2005 2006 2007300,000,000900,000,0001,500,000,0002 ,100,000,0002,700,000,0003,300,000,0003, 900,000,0004,500,000,0005,100,000,0005,7 00,000, first planet found with the aid of a telescope, Uranus was discovered in 1781 by astronomer William Herschel, although he originally thought it was a comet or star. The seventh planet from the Sun is so distant that it takes 84 years to complete one orbit. Like Venus, Uranus rotates east to west. Uranus rotation axis is tilted almost parallel to its orbital plane, so Uranus appears to be rotating on its side. This situation may be the result of a collision with a planet-sized body early in the planet s history, which ap-parently radically changed Uranus rotation. Because of Uranus unusual orientation, the planet experiences extreme variations in sunlight during each 20-year-long season. Voyager 2, the only spacecraft to visit Uranus , imaged a bland-looking sphere in 1986.

Uranus. www.nasa.gov. The first planet found with the aid of a telescope, Uranus was . discovered in 1781 by astronomer William Herschel, although he originally thought it was a comet or star. The seventh planet from the Sun is so distant that it takes 84 years to complete one orbit.

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