In which year did Clyde Tombaugh discover Pluto?
1920
1935
1930
1925
Answer
Pluto was discovered by Clyde Tombaugh in 1930. Tombaugh was a young astronomer working at the Lowell Observatory in Flagstaff, Arizona, at the time of his discovery. He used a blink comparator, a device that rapidly alternated between two photographic plates, to detect Pluto's slight movement against the background stars.
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