On Wednesday of last week, the city of Hiroshima marked the 69th anniversary of the atomic bombing. When the bomb detonated in the air above Hiroshima on August 6, 1945, it destroyed the city and killed up to 140,000 people. Almost everything in a one-mile radius of the target site was immediately razed to the ground. On August 9, a second bomb was dropped on Nagasaki, killing a further estimated 70,000.
Hiroshima was chosen as the primary target for a number of reasons. The US wanted a target city with an urban area of at least three miles diameter. It also had to have been untouched by other air raids, so that the weapon’s impact could be accurately observed. Hiroshima was also thought to be the only potential target city that did not have any Allied prisoner-of-war camps.
But what if the A-bomb had been detonated over Tokyo instead? Or Osaka? Using statistics collated by Dr. Mark A. Carlson at the University of Nebraska, the Japanese Huffington Post has produced this interactive Google map answering just that question.

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