On Feb. 18, 1930, 24-year-old Clyde Tombaugh discovered a faint, remote object on photographic plates he had taken Jan. 23 and Jan. 29 from Lowell Observatory in Flagstaff, Ariz. Astronomers credited ...
Weitekamp, Margaret A., DeVorkin, David H., and Kidd, Diane. 2013. Pluto's Secret: An Icy World's Tale of Discovery. New York: Abrams Books for Young Readers.
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