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 inside the Urakami Cathedral. At the time of the bombing, dozens of people were inside the Cathedral for confession. This section also exhibits a timeline of events which shows a course of events that occurred prior to the bomb being dropped in Nagasaki. Leaflets which American forces dropped on Japan during the early part of 1945 are on display. One gives information on the bombing of Hiroshima and the power of the atomic bomb, warning citizens to leave the city and stop fighting. Also included are melted bottles, the bones of a human hand stuck to a clump of melted