The atomic bomb that destroyed Hiroshima on August 6, 1945, may have killed as many as 140,000 people. Robert Oppenheimer later stated that the scientists who worked on the bomb estimated that it would kill:

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The scientists who worked on the atomic bomb, including Robert Oppenheimer, estimated that it would kill approximately 20,000 people. This estimate was based on the explosive power of the bomb and the density of the population in Hiroshima.

The Atomic Bomb That Destroyed Hiroshima on August 6, 1945