Posted by sierra (6th grade) on Tuesday, March 23, 2010 at 4:56pm.
Only 3 of the 9 planets in our solar system have official "discoverers" and "times of discovery".
Uranus was discovered by Sir William Herschel in 1781.
Neptune was discovered by John Couch Adams in 1846.
Pluto was discovered by astronomer Clyde Tombaugh in 1930.
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