Biographies from the 1900s
⚛️ Clyde Tombaugh (February 4, 1906) - American astronomer who discovered Pluto.
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Further Reading
Clyde Tombaugh - Wikipedia (wikipedia.org)
Clyde Tombaugh: Astronomer Who Discovered Pluto - Space.com (space.com)
March 13, 1930: Clyde Tombaugh's discovery of Pluto announced (aps.org)
February 18, 1930: Clyde Tombaugh discovers Pluto - EarthSky (earthsky.org)
Biography of Clyde W. Tombaugh (lcps.net)
Clyde W. Tombaugh - New Mexico Museum of Space History (nmspacemuseum.org)
Clyde Tombaugh | Academy of Achievement (achievement.org)