On October 30, 1961, the Soviet Union tested the largest nuclear device ever created. The "Tsar Bomba," as it became known, was 10 times more powerful than all the munitions used during World War II.

The Tsar Bomba, the largest and most powerful nuclear weapon ever detonated, remains an iconic and terrifying testament to the destructive power of nuclear energy. Developed by the Soviet Union during ...

The breakthrough would allow the Soviet Union to build its first hydrogen bomb, a device much more powerful that the atomic weapons of only a few years before. SEE ALSO: ...

RDS-37 was the Soviet Union's first two-stage hydrogen bomb, first tested on November 22, 1955. The gun was rated at about 3 megatons. For the test, it was scaled down to 1.6 megatons.

Harry Truman revealed that Soviet Union had exploded an atomic bomb, Sept. 23, 1949. By Andrew Glass 09/23/2011 12:08 AM EDT.

The Soviet Union detonated its first atomic bomb, known in the West as Joe-1, on Aug. 29, 1949, at Semipalatinsk Test Site, in Kazakhstan. The Soviets called their first atomic test "First ...

On this day in 1949, President Harry S. Truman revealed that the Soviet Union had exploded an atomic bomb, ending the American monopoly in nuclear weapons years ahead of what was then thought ...

By 1955, the Soviet Union had detonated their first hydrogen bomb. And even though Soviet Premier Nikita Khrushchev had observed in 1959 that “the explosion of one hydrogen bomb releases more ...

The Soviet Union detonated its first atomic bomb, known in the West as Joe-1, on Aug. 29, 1949, at Semipalatinsk Test Site, in Kazakhstan. The Soviets called their first atomic test "First ...