"The Struggles to Find the Ninth Planet"
Memoir
By: Clyde W. Tombaugh
Date: Unknown
Source: Tombaugh, Clyde W. "The Struggles to Find the Ninth Planet." NASA Jet Propulsion Laboratory (JPL) Outer Planets Solar Probe Project. Available online at http://www.jpl.nasa.gov/ice_fire/9thplant.htm; website home page: http://www.jpl.nasa.gov (accessed October 15, 2002).
About the Author: Clyde Tombaugh (1906–1997) attended high school in his native Streator, Illinois. His amateur astronomy work won him a place at the Lowell Observatory in Flagstaff, Arizona, where he discovered Pluto in 1930. He received his M.S. in physics in 1938 from the University of Kansas, while continuing to work full-time at the Lowell Observatory. During World War II (1939–1945), he was a navigation instructor for the U.S. Navy at Arizona State...
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1930's Science and Technology Primary Sources
The 1930's: Primary Sources
