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Clyde Tombaugh discovered Pluto on Feb. 18, 1930, when he was just 24 years old. While working at the the Lowell Observatory in Flagstaff, Arizona, Tombaugh was assigned the job of using a new photographic telescope to look for an unknown celestial body that was throwing off the movements of both Neptune and Uranus. 

On that February day, he identified a discrepancy in two images taken the previous month. It was a tiny orb, and it had moved positions. After studying the object, the scientists realized Planet X — Pluto — had been found.