Image: July 16, 1945: Trinity nuclear test
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The Trinity explosion, 0.016 seconds after detonation. The fireball is about 600 feet (200 m) wide. Trees may be seen as black objects in the foreground for comparison. Trinity was the code name of the first nuclear weapons test of an atomic bomb. This test was conducted by the United States Army on July 16, 1945, at a location about 35 miles (56 km) southeast of Socorro, New Mexico, at the White Sands Proving Ground, now the White Sands Missile Range. Trinity was a test of an implosion design plutonium device. The weapon's informal nickname was "The Gadget". Using the same conceptual design, the Fat Man device was detonated over Nagasaki, Japan, on August 9, 1945. The Trinity detonation produced an explosive power equivalent to the explosion of about 20 kilotons of TNT. This date is usually considered to be the beginning of the Atomic Age. Source: Los Alamos National Laboratory