A photographic plate produced here at Lowell Observatory in Flagstaff, Arizona, during various stages of a search for a "Planet X" beyond Nepture that led to Clyde Tombaugh's discovery of Pluto in 1930

Established in 1894, Lowell is among the oldest astronomical observatories in the United States. In 2011, it was named one of "The World's 100 Most Important Places" by Time magazine.
Title, date and keywords based on information provided by the photographer.
Gift; Barbara Barrett; 2018; (DLC/PP-2018:112)
Forms part of Carol M. Highsmith's America Project in the Carol M. Highsmith Archive.
Credit line: Photographs in the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.