Clyde Tombaugh

Clyde Tombaugh

Clyde Tombaugh

The American astronomer Clyde Tombaugh discovered Pluto in 1930 following Percival Lowell's prediction of the existence of a planet beyond Neptune.

Working at the Lowell Observatory in Flagstaff, Arizona, Tombaugh carefully looked for the so-called Planet X using a device called a blink comparator. He compared images of the night sky taken at different times to look for objects that moved between frames.

Pluto lost its status as a planet in 2006 when it was reclassified as a Kuiper Belt dwarf planet.

Photo: Clyde Tombaugh using his blink comparator (Science Photo Library)

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Clyde Tombaugh

About Clyde Tombaugh

An American astronomer discovers Pluto in 1930.

About Clyde Tombaugh

Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer. Although he is best known for discovering the dwarf-planet Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt, Tombaugh also discovered many asteroids; he also called for the serious scientific research of unidentified flying objects, or "U.F.O.s".

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