The new nuclear gravity bomb ... A Nukemap image showing the Tsar Bomba exploding over New York City reveals fireball that would vaporize everything within a radius of more than 3.7 miles.

Russian Foreign Minister Sergey Lavrov said that Russia possesses weapons "that will have serious implications for the ...

But it still pales in comparison to the largest man-made explosion ever on Earth - the Soviet Union's Tsar Bomba - King of Bombs - detonated in 1961 in the height of the nuclear arms race.

A newly-declassified video shows the testing of the Tsar Bomba, a nuclear weapon built by the former Soviet Union. The bomb was built in the midst of the Cold War, and only one was ever constructed.

Ukraine's foreign minister said on Saturday that Russia is planning strikes on Ukrainian nuclear facilities before the winter ...

Russian president has been eyeing up renewing nuclear testing on a remote Arctic island where the Soviets previously tested ...

Western leaders fear Russia traded nuclear secrets to Iran in exchange for ballistic missiles aimed at Ukraine, escalating ...

Also during 1942, the Manhattan District of the Corps of Engineers was formed to construct three secret "cities" for major portions of atomic bomb development. At Oak Ridge, Tennessee, a nuclear ...

American and British leaders are growing concerned that Russia may be sharing nuclear secrets with Iran to bolster its ...

Nuclear explosives were first developed as weapons ... had been leaking gas for a full 2 years and 9 months. A 5 km blast radius was cleared for safety, with all personnel and vehicles removed ...

In 1961, the Soviets dropped Tsar Bomba, the most powerful weapon the world has ever seen over the Arctic Ocean. France, China and India also tested nuclear weapons until the 1990s, but as time ...