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17/01/1997 American astronomer Clyde Tombaugh dies

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Reflections on Clyde Tombaugh

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NMSU gives closer look into Clyde Tombaugh's work

Tombaugh is known because of his discovery of the dwarf planet Pluto in 1930. Pluto was considered a planet for until reclassification in 2006. It was the first object from the Kuiper belt ever observed. The Kuiper belt is a disc of small objects extending from the orbit of Neptune (30 astronomical units, AU) to the distance around 50 AU.