On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki, respectively. The bombings killed between 150,000 and 246,000 …

2017年9月6日 · The atomic bomb and nuclear bombs are powerful weapons that use nuclear reactions as their source of explosive energy. Scientists first developed nuclear weapons …

atomic bomb, weapon with great explosive power that results from the sudden release of energy upon the splitting, or fission, of the nuclei of a heavy element such as plutonium or uranium. …

2025年1月30日 · Atomic bombings of Hiroshima and Nagasaki, during World War II, American bombing raids on the Japanese cities of Hiroshima (August 6, 1945) and Nagasaki (August 9, …

The story of the atomic bomb started around the turn of the century when a small number of physicists began to think about, discuss, and publish papers about the phenomenon of …

2009年11月18日 · On August 6, 1945, during World War II (1939-45), an American B-29 bomber dropped the world’s first deployed atomic bomb over the Japanese city of Hiroshima, …

At 2:45 a.m. on Monday August 6, 1945, three American B-29 bombers of the 509th Composite Group took off from an airfield on the Pacific island of Tinian, 1,500 miles south of Japan. …

2021年6月7日 · The United States bombings of the Japanese cities of Hiroshima and Nagasaki on August 6 and August 9, 1945, were the first instances of atomic bombs used against …

2020年8月4日 · The Atomic Bomb and the End of World War II: A Collection of Primary Sources. Seventy years ago this month, the United States dropped atomic bombs on Hiroshima and …

2025年2月9日 · A nuclear weapon is a device designed to release energy in an explosive manner as a result of nuclear fission, nuclear fusion, or a combination of the two. Fission weapons are …