A U.S. official focusing on arms control has provided what he called new, declassified details of a Chinese underground ...

Navigational warnings indicate that the United States has scheduled its first test of a nuclear-capable, but unarmed, intercontinental ballistic missile (ICBM) after President Donald Trump ordered the ...

America’s last nuclear detonation was nothing special. Smaller than the bomb that killed 73,000 people in Nagasaki, it exploded 1,397 feet below the Nevada desert. It shook the ground, created a ...

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