The first atomic bomb was built in Los Alamos, New Mexico, during World War II under a top secret U.S. government program called the Manhattan Project.
Little Boy was the type of atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945 during World War II, making it the first nuclear weapon used in warfare.
By July 1945, the Allies' Manhattan Project had produced two types of atomic bombs: "Little Boy", an enriched uranium gun-type fission weapon, and "Fat Man", a plutonium implosion-type nuclear weapon.
President Truman authorized the use of the atom bombs in an effort to bring about Japan's surrender in the Second World War. In the days following the bombings Japan surrendered. The Manhattan Project was the US government program during World War II that developed and built these first atomic bombs.
Leaflets dropped on cities in Japan warning civilians about the atomic bomb, dropped c. August 6, 1945. TO THE JAPANESE PEOPLE: America asks that you take immediate heed of what we say on this leaflet.
August 6, 1945
On August 6, 1945, the United States dropped an atomic bomb on the city of Hiroshima. The bomb was known as “Little Boy”, a uranium gun-type bomb that exploded with about thirteen kilotons of force. At the time of the bombing, Hiroshima was home to 280,000-290,000 civilians as well as 43,000 soldiers.
Explosive bombs were used in East Asia in 1221, by a Jurchen Jin army against a Chinese Song city. Bombs built using bamboo tubes appear in the 11th century. Bombs made of cast iron shells packed with explosive gunpowder date to 13th century China.
On 16 July 1945 the US detonated the world's first nuclear bomb in the New Mexico desert. The test was final, terrible proof that nuclear energy could be weaponised, and prompted Robert Oppenheimer to recall a passage from the Hindu scripture, Bhagavad Gita: “I am become death, the destroyer of worlds.”
Hiroshima: Atomic Blast That Changed The World Turns 75 The bombings of Hiroshima and Nagasaki were said at the time to be justified as the only way to end World War II. Seventy-five years later, legal experts say they would now be war crimes.
The explicit reason was to swiftly end the war with Japan. But it was also intended to send a message to the Soviets. Ever since America dropped a second atomic bomb on Nagasaki, Japan on August 9, 1945, the question has persisted: Was that magnitude of death and destruction really needed to end World War II
“Revisionist” scholars generally posit that the bombs were unnecessary. Among other claims, they suggest that Japan was ready to surrender and that the use of the bombs could have been avoided if the United States had guaranteed that Emperor Hirohito could remain on his throne.
July 16, 1945. Last test: Sept. 23, 1992.
At 8:15 on August 6, 1945, the world's first atomic bomb was dropped on Hiroshima. Almost the entire city was devastated in that single moment.
Tsar Bomba, (Russian: “King of Bombs”) , byname of RDS-220, also called Big Ivan, Soviet thermonuclear bomb that was detonated in a test over Novaya Zemlya island in the Arctic Ocean on October 30, 1961.
As only one bomb was built to completion, that capability has never been demonstrated. The remaining bomb casings are located at the Russian Atomic Weapon Museum in Sarov and the Museum of Nuclear Weapons, All-Russian Scientific Research Institute Of Technical Physics, in Snezhinsk.
The U.S. Department of Energy has estimated that after five years there were perhaps 200,000 or more fatalities as a result of the bombing, while the city of Hiroshima has estimated that 237,000 people were killed directly or indirectly by the bomb's effects, including burns, radiation sickness, and cancer.
(Image: Library of Congress, LC-USZC4-1663.) On December 7, 1941, Japan staged a surprise attack on Pearl Harbor, decimating the US Pacific Fleet. When Germany and Italy declared war on the United States days later, America found itself in a global war.
The American occupation of Japan ended in 1952, after the U.S. and Japan signed a security treaty for a “peace of reconciliation” in San Francisco in 1951. The agreement let the U.S. maintain military bases there, and a revision in 1960 said the U.S. would come to Japan's defense in an attack.
Was it a war crime Strictly legally speaking, perhaps not, since the Geneva Conventions that existed before the war and during WWII did not say much about civilians. They were concerned about what combatants should do about POWs and similar issues.
Since 1950, there have been 32 nuclear weapon accidents, known as "Broken Arrows." A Broken Arrow is defined as an unexpected event involving nuclear weapons that result in the accidental launching, firing, detonating, theft, or loss of the weapon. To date, six nuclear weapons have been lost and never recovered.
Modern weapons usually have less power than bombs of old, between 10 and 100 kilotons according to The Washington Post, but they could still dwarf the ones deployed in Hiroshima and Nagasaki, which had blasts equivalent to 15,000 and 21,000 tons of TNT, respectively.
The most significant material constraint on using nuclear weapons was the risk of a wider war with China. U.S. leaders worried that a U.S. invasion of North Vietnam or the use of tactical nuclear weapons there could bring China into the war.
Also known as RDS-220 or RDS-202, the Tsar Bomba is a hydrogen fusion bomb that was tested on October 30, 1961, during the Cold War, and it was visible at a distance of more than 1,000 km from the epicentre of its explosion, rose to a height of 67 km and had a peak width of 95 km.
The dropping of the atomic bomb on Hiroshima was justified at the time as being moral – in order to bring about a more rapid victory and prevent the deaths of more Americans. However, it was clearly not moral to use this weapon knowing that it would kill civilians and destroy the urban milieu.
Deaths by Country
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