Clyde Tombaugh
Date: 1928
Photograph of astronomer Clyde William Tombaugh, 1906-1997, at age 22 with his homemade 9 inch Newtonian Telescope on his family farm near Burdett, Kansas. Tombaugh discovered the planet Pluto in 1930 and fourteen asteroids during his long career.

Clyde Tombaugh
Creator: New York Times Company
Date: 1930
Front page article on the discovery of planet Pluto from the New York Times, March 14, 1930.

Clyde Tombaugh
Date: 1938
Clyde Tombaugh, 1906-1997, examining planet photograph plates under the Blink Microscope Comparator at the Lowell Observatory.