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- An atomic bomb, codenamed "Little Boy," was dropped over Hiroshima Japan on August 6, 1945. The bomb, which detonated with an energy of around 15 kilotons of TNT, was the first nuclear weapon deployed in wartime. The crew of the Boeing B-29 bomber, Enola Gay, which made the flight over Hiroshima to drop the first atomic bomb.
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On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. The bombings killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict.
- Fat Man
The name Fat Man refers to the early design of the bomb...
- Yoshito Matsushige
Yoshito Matsushige (松重 美人, Matsushige Yoshito, January 2,...
- Atomic Bombs
A nuclear weapon is an explosive device that derives its...
- Shima Hospital
Shima Hospital (島病院, Shima byōin) is a Japanese hospital,...
- Radiation Sickness
Acute radiation syndrome (ARS), also known as radiation...
- Hiroshima Peace Memorial
The Hiroshima Peace Memorial (広島平和記念碑, Hiroshima Heiwa...
- Fat Man
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- Nuclear Bombs and Hydrogen Bombs
- Manhattan Project
- Who Invented The Atomic Bomb?
- Hiroshima and Nagasaki Bombings
- The Cold War
- Cuban Missile Crisis
- Three Mile Island
- Nuclear Non-Proliferation Treaty
- Illegal Nuclear Weapon States
- North Korea
A discovery by nuclear physicists in a laboratory in Berlin, Germany, in 1938 made the first atomic bomb possible, after Otto Hahn, Lise Meitner and Fritz Strassman discovered nuclear fission. In nuclear fission, the nucleus of an atom of radioactive material splits into two or more smaller nuclei, which causes a sudden, powerful release of energy....
On December 28, 1942, President Franklin D. Roosevelt authorized the formation of the Manhattan Projectto bring together various scientists and military officials working on nuclear research. The Manhattan Project was the code name for the American-led effort to develop a functional atomic bomb during World War II. The project was started in respon...
Much of the work in the Manhattan Project was performed in Los Alamos, New Mexico, under the direction of theoretical physicist J. Robert Oppenheimer, the “father of the atomic bomb.” On July 16, 1945, in a remote desert location near Alamogordo, New Mexico, the first atomic bomb was successfully detonated—the Trinity Test. It created an enormous m...
Scientists at Los Alamos had developed two distinct types of atomic bombs by 1945—a uranium-based design called “the Little Boy” and a plutonium-based weapon called “the Fat Man.” (Uranium and plutonium are both radioactive elements.) While the war in Europe had ended in April, fighting in the Pacific continued between Japanese forces and U.S. troo...
The United States was the only country with nuclear weaponry in the years immediately following World War II. The Soviet Unioninitially lacked the knowledge and raw materials to build nuclear warheads. Within just a few years, however, the U.S.S.R. had obtained—through a network of spies engaging in international espionage—blueprints of a fission-s...
Over the next few decades, each world superpower would stockpile tens of thousands of nuclear warheads. Other countries, including Great Britain, France, and China, developed nuclear weapons during this time, too. To many observers, the world appeared on the brink of nuclear war in October of 1962. The Soviet Union had installed nuclear-armed missi...
Many Americans became concerned about the health and environmental effects of nuclear fallout—the radiation left in the environment after a nuclear blast—in the wake of World War II and after extensive nuclear weapons testing in the Pacific during the 1940s and 1950s. The antinuclear movement emerged as a social movement in 1961 at the height of th...
The United States and Soviet Union took the lead in negotiating an international agreement to halt the further spread of nuclear weapons in 1968. The Treaty on the Non-Proliferation of Nuclear Weapons(also called the Non-Proliferation Treaty or NPT) went into effect in 1970. It separated the world’s countries into two groups—nuclear weapons states ...
Some countries wanted the option of developing their own nuclear weapons arsenal and never signed the NPT. India was the first country outside of the NPT to test a nuclear weapon in 1974. Other non-signatories to the NTP include: Pakistan, Israeland South Sudan. Pakistan has a known nuclear weapons program. Israel is widely believed to possess nucl...
North Koreainitially signed the NPT treaty, but announced its withdrawal from the agreement in 2003. Since 2006, North Korea has openly tested nuclear weapons, drawing sanctions from various nations and international bodies. North Korea tested two long-range intercontinental ballistic missiles in 2017—one reportedly capable of reaching the United S...
- Missy Sullivan
- 1 min
Nov 18, 2009 · 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, immediately killing 80,000 people.
Nov 15, 2019 · On August 6, 1945, the United States detonated a nuclear weapon on the Japanese city of Hiroshima. Three days later, on August 9, the US followed the initial attack with another detonation in the city of Nagasaki. Both times, the bombings had the support of the United Kingdom as was outlined in the Quebec Agreement.
- Ferdinand Bada
The atomic bombing of Hiroshima occurred on August 6, 1945 around 8:15 AM. Hiroshima is a city, capital of Hiroshima ken (prefecture), near the southwestern end of Honshu island, Japan. It lies at the head of Hiroshima Bay, an embayment of the Inland Sea.
Aug 8, 2020 · It is 75 years since the US dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki on 6 and 9 August, leading to the end of World War Two. Getty Images. The devastated city of...
Aug 6, 2020 · Bells have tolled in Hiroshima, Japan, to mark the 75th anniversary of the dropping of the world's first atomic bomb. But memorial events were scaled back this year because of the pandemic.
