Iran's top diplomat has held talks with the U.N. nuclear watchdog in Geneva before a second round of negotiations between the ...

A small nuclear test reactor arrived in Utah aboard U.S. military aircraft. It won’t power homes, but state and federal leaders say it signals a new chapter for Utah’s energy future. Here’s what to ...

Oklahoma documentary "67 Bombs to Enid" shares Marshallese survivors’ stories, linking past U.S. nuclear tests to today’s ...

The Pentagon is quietly transporting a next-generation nuclear reactor across the American West, routing it from Southern California through Utah, in what amounts to a live stress test for the country ...

A groundbreaking shift in nuclear energy is underway as a new micro-nuclear reactor, small enough to fit in a plane, embarks on its journey for testing.

According to the latest estimates from the US Department of Defense, China possessed more than 600 nuclear warheads by the end of 2024 and is on track to cross 1,000 by 2030.

Jay Cowan still worries about the Rulison blast’s proximity to the Colorado River and expresses disbelief at the 107 days that radioactive gas was burned in order to test whether the radionuclides ...

China is on course to have more than 1,000 nuclear warheads in the next few years, according to U.S. intelligence estimates.

The Rulison test — conducted at a depth of 8,425 feet — was the deepest subterranean nuclear-bomb detonation conducted in U.S. history.

A top arms diplomat at the State Department recently laid out what might come next as Washington upends decades of federal policies on nuclear proliferation.

In 1963, President John F. Kennedy kicked off a decades-long effort to reduce the risk of nuclear war, when he signed the Limited Test Ban Treaty. Subsequent presidents forged new agreements, but now ...