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Clyde William Tombaugh / ˈ t ɒ m b aʊ / (February 4, 1906 – January 17, 1997) was an American astronomer. He discovered the ninth planet Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt .
Aug 15, 2015 · On February 18, 1930, at only 24 years of age, Clyde Tombaugh made a historic discovery. A young astronomer fascinated with the stars, Tombaugh found what was then believed to be the 9th planet of our solar system.
- Briana Jones
Feb 18, 2022 · On February 18, 1930, Tombaugh compared photos of a single star field – taken six days apart a few weeks earlier – and noticed an object was moving against the backdrop of stars.
Clyde Tombaugh: the astronomer who discovered Pluto | BBC Sky at Night Magazine.
Clyde Tombaugh (born February 4, 1906, Streator, Illinois, U.S.—died January 17, 1997, Las Cruces, New Mexico) was an American astronomer who discovered Pluto in 1930 after a systematic search for a ninth planet instigated by the predictions of other astronomers.
- The Editors of Encyclopaedia Britannica
Feb 18, 2015 · 18 February 1930: Farmer-turned-astronomer Clyde Tombaugh (pictured), aged 24, discovers Pluto while comparing photographic plates of the night sky at Lowell Observatory in Flagstaff, Arizona.
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Tombaugh's task was to systematically image the night sky in pairs of photographs, then examine each pair and determine whether any objects had shifted position. Using a blink comparator , he rapidly shifted back and forth between views of each of the plates to create the illusion of movement of any objects that had changed position or appearance between photographs.
