Manhattan Project

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Summary

The Manhattan Project was a research and development program undertaken during World War II to produce the first nuclear weapons.

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plutonium-based implosion bomb developed by the project
This implosion-type weapon was the second nuclear device used in warfare, dropped on Nagasaki in August 1945.
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uranium-based atomic bomb developed by the project
This gun-type weapon was the first nuclear device used in warfare, dropped on Hiroshima in August 1945.
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catalyst for the United States nuclear program
This 1939 letter to President Franklin D. Roosevelt urged the U.S. to begin research into nuclear fission, directly leading to the Manhattan Project.
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first successful detonation of a nuclear weapon
This July 1945 test in New Mexico was the culmination of the Manhattan Project's research and development efforts.
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military head of the Manhattan Project
General Groves was the U.S. Army Corps of Engineers officer responsible for overseeing the entire project, including construction and security.
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scientific director of the Manhattan Project
As the director of the Los Alamos Laboratory, he led the scientific effort to design and build the first atomic bombs.
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primary research and design site for the project
Established as Site Y, this laboratory was the central hub where the actual design and assembly of the atomic bombs took place.
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physical process powering the Manhattan Project weapons
The project was founded on the discovery of nuclear fission, which releases massive amounts of energy when heavy nuclei are split.
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first artificial nuclear reactor built for the project
Constructed under the stands of Stagg Field, this reactor demonstrated the nuclear chain reaction necessary for the development of nuclear weapons.
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served as a key scientific leader
Fermi was a central figure in the project, providing critical theoretical and experimental expertise for the development of the first atomic bombs.
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plutonium production facility for the Manhattan Project
This site housed the B Reactor, which produced the plutonium used in the Fat Man bomb design.
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major production site for uranium enrichment
Known as Site X during the war, this facility was critical for the electromagnetic and gaseous diffusion separation of uranium-235.
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physicist who initiated the project's precursor
He drafted the Einstein-Szilard letter, which alerted President Roosevelt to the potential for German nuclear weapons development.
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