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The bomb exploded over Hiroshima at 8:15 on the morning of August 6, 1945. About an hour previously, the Japanese early warning radar net had detected the approach of some American aircraft headed for the southern part of Japan.
Aerial view of the bombing of Hiroshima on August 6, 1945.US Department of Energy. Seventy years ago, the US Air Force's Enola Gay B-29 Superfortress bomber dropped a 15-kiloton nuclear bomb, code-named Little Boy, on the Japanese city of Hiroshima.