This one was made from 8 kilograms of plutonium-239 90 Pu-239.

What atomic bomb was dropped on nagasaki. National Archives Identifier 535795. The Nagasaki bomb was regarded as the more complex design. Three days later a second B-29 dropped another A-bomb on Nagasaki killing an estimated 40000 people.

Department of Defense Nagasaki Japan 1945 after the atomic bomb. Exactly 70 years ago the US dropped the atomic bomb nicknamed Little Boy on Hiroshima killing 140000 of its 350000 citizens. At 1102 am on August 9 1945 the US B029 bomber boxcar dropped a 45-ton plutonium bomb called the Fat ManEstimated 60000 to 80000 lives lost One of the darkest chapters in the history of war in human civilization is the atomic bombing of the United States on the Japanese cities of Hiroshima and Nagasaki during World War II.

On August 9 1945 a second atom bomb is dropped on Japan by the United States at Nagasaki resulting finally in Japans unconditional surrender. The first man made reactor from the University of Chicago was employed that used extremely pure. Photograph courtesy National Archives and Records.

The Atomic Bombing of Hiroshima and Nagasaki features a letter written by Luis Alvarez a physicist who worked on the Manhattan Project on August 6 1945 after the first atomic bomb was dropped on Hiroshima Japan. In August of 1945 the American military was preparing plans for the upcoming invasion of mainland Japan. The Little Boy bomb dropped on Hiroshima was made of highly enriched uranium-235 while the Fat Man bomb dropped on Nagasaki was made of plutonium.

Japans Emperor Hirohito announced his countrys unconditional surrender in World War II. It has been 76 years since the atomic bomb was dropped on Nagasaki in 9 days. The devastation wrought at Hiroshima was not.

Fat Man is the codename for the type of nuclear bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945. The first atomic bomb Little Boy which had the gun type configuration was dropped on Hiroshima on August 6 1945. Atomic bomb at Nagasaki Japan On August 9 1945 three days after detonating a uranium-fueled atomic bomb over Hiroshima Japan the United States dropped a plutonium-fueled atomic bomb over the Japanese port of Nagasaki.