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Trinity test
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Atomic bomb Manhattan Project interactive timeline
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.
First self-sustaining nuclear chain reaction Locator map of New Mexico and surrounding states, highlighting the position of the Trinity nuclear test site in southern New Mexico, with Santa Fe also marked. The map shows state boundaries and a small inset globe for geographic context. Trinity test 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.
What was the Manhattan Project?
J. Robert Oppenheimer and Leslie R. Groves Trinity Site

Trinity test: References & Edit History

Article Contributors

Primary Contributors

  • Michael Ray
    Michael Ray is an assistant managing editor who has worked at Britannica since 2003. In addition to leading the Geography and History team, he oversees coverage of European history and military affairs. He earned a B.A. in history from Michigan State University in 1995.
  • Scott Spires
    Scott Spires is Associate Editor for Geography at Encyclopædia Britannica.
  • 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: The National WWII Museum - Trinity: Why It Really Mattered. Aug 26, 2026
Anniversary information added. Jul 14, 2026
Add new Web site: The Belfer Center for Science and International Affairs - 80th Anniversary of the Trinity Test. Jul 11, 2026
Add new Web site: ABC listen - Late Night Live - The Trinity test fallout continues. Feb 21, 2026
Add new Web site: The National WWII Museum - Trinity: Why It Really Mattered. Dec 19, 2025
Add new Web site: Atomic Heritage Foundation - Trinity Test -1945. Nov 06, 2025
Add new Web site: U.S. Department of Energy - The Manhattan Project - The Trinity Test. Sep 13, 2025
Media added. Aug 01, 2025
New article added. Jul 14, 2025
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