Nuclear explosion debris. The first man made nuclear explosion occurred on July 16, 1945 at 5:50 am on the Trinity Test Site near Alamogordo, New Mexico in the United States, an area now known as the White Sands Missile Range. The event involved the full-scale testing of an implosion-type fission atomic bomb. In a memorandum to the U.S. Secretary of War, General Leslie Groves describes the yield as equivalent to 15,000 to 20,000 tons of TNT. Following this test, a uranium-gun type nuclear bomb (Little Boy) was dropped on the Japanese city of Hiroshima on August 6, 1945, with a blast yield
Nagasaki Atomic Bomb Museum in such a way that the audience can see just what effect the bomb had on the city, the reconstruction, and the lasting effects of the atomic bomb. The museum opens with a room dedicated to the city as it was just before the bomb decimated Nagasaki. A clock which stopped at 11:02, the precise time the bomb hit the city, is also on display to demonstrate how so many people were killed in an instant. In the next section, visitors enter a room which shows Nagasaki just after the bombings. Included in this room is a water tank with