The question of whether Iran's Supreme Leader Ali Khamenei has authorised the development of nuclear weapons has taken on urgency following the devastating 12-day conflict with Israel in June. Israeli ...

In discussing his reasoning for launching U.S. airstrikes on Iran, President Donald Trump said, "An Iranian regime armed with long-range missiles and nuclear weapons would be a dire threat to every ...

Small, possibly portable, nuclear reactors that can’t melt down are moving toward reality in the United States, with what may be the first two coming online or beginning construction this year. The US ...

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 ...

The allegations were leveled by U.S. officials late last week. Arms control experts worry that norms against nuclear testing are unraveling.

Scientific knowledge about the damaging effects of nuclear-weapons testing helped to end such tests. Those findings haven’t changed.

Using the five megawatt reactor would mean US forces could operate without fear that an enemy might cut fuel supplies.

As U.S. electricity demand rises and technology companies seek to build more and larger data centers to drive artificial intelligence systems, the main question arising is how to generate all that ...

There is a growing threat of Putin using a nuclear weapon in Ukraine. Admiral James Stavridis on how the West should respond if he does ...