In what year was the ninth planet discovered?

donna_bonna

1930 Pluto was discovered in 1930 by a fortunate accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune, based on the motions of Uranus and Neptune. Not knowing of the error, Clyde W. Tombaugh at Lowell Observatory in Arizona did a very careful sky survey which turned up Pluto anyway. http://www.nineplanets.org/pluto.html [Added reference - McG] Feb 09 05, 10:25 AM

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In which year was the planet Pluto discovered? Who discovered the planet Uranus in 1781? Who discovered the planet Neptune in 1846? How was the planet Neptune discovered?

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