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What Lies Beyond the Planets?

Planet X. This name was given by astronomer Percival Lowell to an undiscovered planet that he suspected was orbiting beyond Neptune. His search for Planet X began in 1905 at his observatory in Flagstaff, Arizona. Although Lowell died before finding Planet X, the search he began continued. Finally, in 1930, at Lowell’s observatory, Clyde Tombaugh discovered the planet

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