Russian nuclear chief warns of threats to country's existence, emphasizes need to strengthen nuclear shield as U.S.-Russia ...

Russia has accused Ukraine of drone strikes that sparked a fire at a nuclear power plant in the Kursk region Sunday as ...

The United States, Soviet Union, Britain, France and China all scrambled to develop ever more powerful nuclear weapons ...

Kyiv has said its strikes are in response to Russia's attacks on Ukraine and are aimed at destroying infrastructure deemed ...

"They want Iran to be obedient to America. The Iranian nation will stand with all of its power against those who have such ...

In Japan and South Korea there is deepening concern over the reliability of long-time American security guarantees – whether ...

The reactors have more than 110 times the energy density of existing diesel systems, according to Radiant, and can be ...

Interstellar object 3I/ATLAS shows an unexpected frontal glow that Harvard's Avi Loeb says cannot be explained by sunlight ...

The clash over Iran's nuclear program is escalating, with U.S. sanctions and Europe's snapback threat putting Tehran under ...

Iran's foreign minister has spoken with his French, German, and British counterparts, trying to stop the reimposition of U.N.

Turning radioactive nuclear waste into a rare isotope could be the least expensive way to power future fusion reactors.