The U.S. Navy carried out four scheduled unarmed missile tests of the Trident II D5LE off the coast of Florida last week.

Iran has likely carried out an undeclared missile test at its Imam Khomeini Spaceport, according to satellite photos analyzed ...

North Korea has enriched up to two tonnes of uranium – enough to build 47 nuclear bombs, according to South Korean estimates.

SAN CLEMENTE, Calif. (KABC) -- Sirens went off three times between 10 a.m. and noon Wednesday in the San Onofre area, possibly the final drill from the San Onofre Nuclear Generation Station, as the ...

Decades after Semipalatinsk, the collapse of arms control leaves the world on the edge again.

Afghanistan's Bagram Air Base is about 1,200 miles from an old Chinese nuclear test range, but controlling the base would require the reentry of U.S. personnel into Afghanistan.

Even eighty years after the first nuclear bomb test, the consequences still haunt people all around the world. Radioactive fallout hasn’t just vanished; instead, it continues to affect the health of ...

Russian President Vladimir Putin has announced that Moscow will adhere to nuclear arms limits for one more year after the ...

Launch pad shows scorch marks characteristic of solid-fuel missile launch, after social media lit up with sightings of a ...

Spacecraft have used a plutonium isotope to stay afloat for decades, but another isotope could last even longer.