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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
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Trinity test: Media

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Videos

The True Story of Oppenheimer and the Atomic Bomb
J. Robert Oppenheimer became involved in nuclear research in 1941. His biopic, Oppenheimer,...
Video: Encyclopædia Britannica, Inc.; thumbnail © Universal Pictures
What was the Manhattan Project?
Learn more about the Manhattan Project.
Video: Encyclopædia Britannica, Inc.

Images

Atomic bomb
The first atomic bomb test, near Alamogordo, New Mexico, July 16, 1945.
Jack Aeby/Los Alamos National Laboratory
First self-sustaining nuclear chain reaction
Scientists observing the world's first self-sustaining nuclear chain reaction, in...
National Archives and Records Administration (ARC Identifier 542144)
The Trinity Site
Encyclopædia Britannica, Inc.
Trinity test
Physicist Norris Bradbury sits next to Gadget, the nuclear device that would...
© Corbis Historical/Getty Images
Discover more about the first atomic bombs
The first atomic bomb was detonated on July 16, 1945, in New Mexico as part of the...
Encyclopædia Britannica, Inc.
J. Robert Oppenheimer and Leslie R. Groves
At the Trinity test site in Alamogordo, New Mexico, J. Robert Oppenheimer (left)...
Courtesy of the Los Alamos National Laboratory, New Mexico
Trinity Site
An obelisk made of volcanic rock that marks Ground Zero, the site of the detonation...
Wendy Brown, Fort Bliss Bugle/U.S. Department of Defense
Trinity Site
A sign warning visitors not to take trinitite, photographed during a Trinity Site...
Wendy Brown, Fort Bliss Bugle/U.S. Department of Defense
Trinitite made during the Manhattan Project
Trinitite, also known as atomsite or Alamogordo glass, produced by the intense heat...
© Steve Shoup/Shutterstock.com

Interactives

Manhattan Project interactive timeline
Major events and locations of the Manhattan Project.
National Archives, Washington, D.C.; Animation Encyclopædia Britannica, Inc.
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