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The man who found Pluto

At 24 and with no formal education in astronomy, Clyde William Tombaugh set out to find "Planet X."
The faint, starry image jumped a little - very little, in fact. But the heart of young Clyde Tombaugh, who saw the telltale twitch late one Tuesday afternoon in February 1930, jumped a good bit more. Lowell Observatory, in Flagstaff, Arizona, had hired Tombaugh just one year earlier. The oldest of Muron and Adella Tombaugh's six children, Clyde Tombaugh was born in Streator, Illinois, in 1906. He became interested in astronomy early in his childhood, and in his later years often remembered with...

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