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Fat Man
Introduction & Top Questions References & Edit History
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Infographic detailing the atomic bombing of Nagasaki on August 9, 1945, during World War II. It includes a map of Japan highlighting Nagasaki, facts about the Fat Man bomb, casualty statistics showing about 70,000 dead by year's end, symptoms of radiation injury, and notes on the city's rebuilding and peace movement. J. Robert Oppenheimer and Leslie R. Groves Manhattan Project interactive timeline Large mushroom cloud rising over Nagasaki, Japan, after the atomic bombing on August 9, 1945, with smoke and debris spreading across the sky and ground below. Nagasaki after the atomic bomb Bikini atomic bomb test

Fat Man: References & Edit History

Article Contributors

Primary Contributors

  • Adam Volle
    Adam Volle is a freelance writer and editor based in Atlanta, Georgia. 

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Invalidated site: Stanford University - The Designs of Fat Man and Little Boy. Aug 01, 2026
Add new Web site: Air Force Armament Museum - Fat Man Munition. Nov 28, 2025
Add new Web site: Stanford University - The Designs of Fat Man and Little Boy. Sep 19, 2025
Added Questions and Answers. Jul 15, 2025
Add new Web site: The National WWII Museum - The bombing of Nagasaki, August 9, 1945. Jun 07, 2025
Add new Web site: Atomic Heritage Foundation - The National Museum of Nuclear Science and History - Little Boy and Fat Man. Jan 17, 2025
Add new Web site: U.S. Department of Energy - Office of Scientific and Technical Information - The Atomic Bombing of Nagasaki, August 9, 1945. Oct 25, 2024
Add new Web site: National Museum of the U.S. Navy - Fat Man - Nagasaki. Jun 21, 2024
New article added. Apr 16, 2024
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