Clyde Tombaugh

Clyde William Tombaugh (/ˈtɒmbaʊ/; February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would eventually be recognized as the Kuiper belt. At the time, Pluto was referred to as the ninth planet in the Solar System, a classification that stood for over seven decades.

Born in Illinois, and raised on farms in Kansas, Tombaugh was largely self-taught astronomy and optical engineering, building his own telescopes from spare parts and grinding lenses by hand. His skill and determination led to a position at Lowell Observatory in Flagstaff, Arizona, where he conducted photographic surveys of the night sky. In addition to Pluto, Tombaugh identified hundreds of asteroids and a variety of star clusters, galaxies, and variable stars, thereby contributing significantly to the cataloguing of the night sky.