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"Planet X". In the early 1900's, noted astronomers Percival Lowell and William Pickering used the 1840 mathematical model of Urbain LeVerrier to predict locations for a planet that would explain the orbital perturbations of the planet Uranus, which did not seem possible due to Neptune alone. Lowell called it 'Planet X' and estimated its size as large as Neptune or larger. In 1929, the search fell to Clyde Tombaugh, who located Pluto in 1930 (oddly enough, a photograph by Lowell in 1915 was found to have a faint image of the planet, once its location was known).

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Q: What was Pluto called before it was officially named?
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