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At the close of World War II, the Soviet Union had special search teams operating in Austria and Germany, especially in Berlin, to identify and obtain equipment, material, intellectual property, and personnel useful to the Soviet atomic bomb project.
1945 – July 22 – Truman alludes to Stalin about having successfully detonated an atomic bomb at the Potsdam Conference. [18] [6] 1945 – August 6 – "Little Boy", a gun-type uranium-235 weapon, is dropped on Hiroshima, Japan. 1945 – August 9 – "Fat Man", an implosion-type plutonium-239 weapon, is dropped on Nagasaki, Japan.
The first atomic bombs dropped on Hiroshima and Nagasaki on August 6 and 9, 1945, respectively, were large, custom-made devices, requiring highly trained personnel for their arming and deployment. They could be dropped only from the largest bomber planes—at the time the B-29 Superfortress —and each plane could only carry a single bomb in ...
Rumors that Germany had an atomic bomb persisted as late as March 1945, [66] but all signs pointed to the lack of a production program. On March 16, Groves wrote to Bissell that "the most complete and factual information we have obtained bearing on the nature of the German effort in our field"— the results of the Strasbourg mission — "tends ...
U.S. and Soviet/Russian nuclear weapons stockpiles/inventories from 1945 to 2006. The failing Soviet economy and the dissolution of the country between 1989 and 1991 which marks the end of the Cold War and with it the relaxation of the arms race, brought about a large decrease in both nations' stockpiles.
By 2015, the U.S. public was close to evenly split on whether the use of nuclear weapons was justified. Oppenheimer himself was deeply conflicted about the weapons he helped create.
Mar. 16—The Manhattan Project in New Mexico was front and center in 1945. In nanoseconds, the bombing of Hiroshima and Nagasaki in Japan at the end of World War II changed the nature of warfare ...
The transcripts seem to indicate that the physicists, in particular Heisenberg, had either overestimated the amount of enriched uranium that an atomic bomb would require or consciously overstated it, and that the German project was at best in a very early, theoretical stage of thinking about how atomic bombs would work; in fact, it is estimated ...