The Manhattan Project

Military-Civilian Relations

Trinity Site

The birth of nuclear weapons occurred on July 16, 1945 at the Alamogordo Bombing and Gunnery Range in New Mexico, 230 miles south of Los Alamos. Gadget (as the bomb was known) was an implosion plutonium bomb, like the one used at Nagasaki, and detonated with 20 kilotons of force, slightly more than the Little Boy bomb dropped on Hiroshima. Originally the test was to occur at 4 a.m., but it was delayed to 5:30 after an early morning thunderstorm. At 5:29:45, Gadget exploded and the Atomic Age began.

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