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Manhattan Project
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Atomic bomb
Split image showing Dr. J. Robert Oppenheimer at a chalkboard on the left and actor Cillian Murphy portraying Oppenheimer with a cigarette and hat on the right.
What was the Manhattan Project?
Leslie Groves Manhattan Project interactive timeline Infographic timeline of the Manhattan Project set against a background of an atomic bomb explosion, detailing major scientific discoveries, project milestones, bomb test and deployment dates, and key locations such as Los Alamos, Oak Ridge, and Hanford, from the 1930s through the end of World War II. Diagram showing three nuclear weapon designs: a gun-assembly fission bomb with uranium-235 and a conventional explosive, an implosion fission bomb with a plutonium-239 core surrounded by explosive lenses, and a boosted-fission bomb with a plutonium core, uranium tamper, and fusion fuel, all labeled with their main components inside cutaway metal casings. First self-sustaining nuclear chain reaction 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. J. Robert Oppenheimer
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Manhattan Project: References & Edit History

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Article History

Type Description Contributor Date
Modified link of Web site: Carnegie Mellon University - Encyclopedia of the History of Science - Manhattan Project. Sep 26, 2026
Add new Web site: HistoryNet - What Ever Happened to the French Foreign Legion? Aug 01, 2026
Add new Web site: Clemson University Open Textbooks - Science Technology and Society a Student Led Exploration - Nuclear fission and the Manhattan Project. Mar 20, 2026
Add new Web site: Carnegie Corporation of New York - Manhattan Project. Feb 03, 2026
Article revised and updated. Jul 15, 2025
Add new Web site: Bill of Rights Institute - The Manhattan Project. Jun 20, 2025
Add new Web site: Georgetown University Library - The Manhattan Project: A New and Secret World of Human Experimentation. Apr 14, 2025
Questions and answers added. Jan 30, 2025
Questions and answers added. Jan 17, 2025
Add new Web site: The National WWII Museum - The Pope of Physics: Enrico Fermi and the Manhattan Project. Nov 12, 2024
Add new Web site: Energy.gov - The Manhattan Project. Jul 22, 2024
Added cross-reference. Jun 14, 2024
Add new Web site: Live Science - What was the Manhattan Project? May 27, 2024
Add new Web site: National Park Service - What is the Manhattan Project? Apr 17, 2024
Add new Web site: Atomicarchive.com - The Manhattan Project: Making the Atomic Bomb. Mar 08, 2024
Media added. Jul 18, 2023
Added link to Manhattan Project interactive timeline. Jul 17, 2023
Media added. Jul 17, 2023
Corrected display issue. Jul 13, 2023
Media added. Jul 13, 2023
Added information about Operation Crossroads. Jul 07, 2023
Add new Web site: Carnegie Mellon University - Encyclopedia of the History of Science - Manhattan Project. Mar 29, 2023
Add new Web site: Chemistry LibreTexts - The Manhattan Project - Labs and Fuel. Dec 13, 2022
Add new Web site: Atomic Heritage Foundation - The Manhattan Project. Aug 29, 2022
Add new Web site: U.S. History - The Manhattan Project. Mar 30, 2022
Infographic added. Jun 11, 2021
Media added. Jun 11, 2021
Corrected display issue. Sep 10, 2020
Media added. Jan 16, 2020
Add new Web site: United States History for Kids - Manhattan Project. Oct 21, 2019
Corrected display issue. Jul 18, 2017
Add new Web site: Public Broadcasting Service - American Experience - Race for the Superbomb: People, Events, Maps, Timeline and More. Jan 27, 2017
Add new Web site: Public Broadcasting Service - American Experience - Race for the Superbomb: People, Events, Maps, Timeline and More. Jan 27, 2017
Add new Web site: Los Alamos History - The Manhattan Project. Nov 30, 2016
Add new Web site: U.S. Department of Energy - Office of Science and Technical Information - The Manhattan Project: An Interactive History. Nov 30, 2016
Media added, Apr 17, 2015
Cross-references added. Apr 17, 2015
Add new Web site: American Museum of Natural History - The Manhattan Project. Apr 04, 2014
Add new Web site: United States History - The Manhattan Project. Nov 23, 2012
Add new Web site: Energy.gov - Office of Management - Manhattan Project. Nov 23, 2012
Add new Web site: The History Learning Site - The Manhattan Project. Nov 23, 2012
Add new Web site: Spartacus Educational - Manhattan Project. Nov 23, 2012
Add new Web site: Fact Monster - Science - Manhattan Project. Jul 27, 2010
Added new Web site: How Stuff Works - Science - How the Manhattan Project Works. Feb 10, 2009
Added new Web site: Atomic Archive. May 12, 2006
Article revised. Apr 28, 2005
Article added to new online database. Jul 20, 1998
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