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Little Boy
References & Edit History Quick Facts & Related Topics
Images, Videos & Interactives
Aerial view of a large mushroom cloud rising high above Hiroshima, Japan, following the atomic bombing on August 6, 1945. Manhattan Project interactive timeline Infographic titled The First Atomic Bombs, showing key facts about the first atomic bomb test in New Mexico and the bombings of Hiroshima and Nagasaki in Japan during World War II. Includes diagrams of bomb mechanisms, a map of Japan with target cities, and illustrations of the Little Boy and Fat Man bombs, along with details on deployment, explosive yield, and estimated casualties.
The impact of the atomic bomb on Hiroshima
Infographic explaining the atomic bombing of Hiroshima on August 6, 1945, including a map of Japan, details about the Little Boy bomb, casualty statistics, symptoms of radiation injury, and information on Hiroshima's rebuilding and peace memorials. Key figures show about 140,000 deaths by year's end, symptoms such as hair loss and internal bleeding, and the city's postwar transformation into a peace symbol.

Little Boy: References & Edit History

Article Contributors

Primary Contributors

  • Sanat Pai Raikar
  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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: Atomic Heritage Foundation - The National Museum of Nuclear Science and History - Little Boy and Fat Man. Jul 31, 2026
Anniversary information added. Jul 30, 2026
Add new Web site: Stanford University - The Designs of Fat Man and Little Boy. Sep 19, 2025
New article added. Jul 24, 2025
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