Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

In 1961, the Soviet Union detonated the largest nuclear weapon ever built, a test so powerful it sent shockwaves around the ...

Opinion: This op-ed's authors argue that the president's nuclear testing comments were correct, considering America's aging ...

The Soviet Union built the largest nuclear weapon ever detonated, but just before its test, engineers deliberately reduced ...

As the cloud cleared, Air Force bombers dropped in to gather air samples. Researchers hoped that the radioactive fallout ...

During the Cold War the U.S. considered putting nuclear weapons on balloons and letting them float into enemy territory for a ...

North Korea says leader Kim Jong Un has observed test-flights of hypersonic missiles and underscored the need to bolster the ...

The possession of a functioning hypersonic weapon would give North Korea an ability to penetrate the US and South Korea's ...

The Russian Defense Ministry said on Friday that it had struck western Ukraine with a nuclear-capable intermediate-range ...

In the wake of U.S. President Donald Trump’s suggestion earlier this year that the U.S. would resume nuclear testing, a U.S. government representative defended the stance at a global nuclear arms ...

China is rapidly overhauling a network of secret facilities used to manufacture warhead components as it expands its nuclear stockpile faster than any other country, according to an analysis of ...