Evidence that Russia is racing to perfect a nuclear-armed spacecraft to target Western satellites is sparking the U.S. and ...

Watch how the first atomic bomb test unfolded, as scientists pushed the limits of physics in a race to end the war. Behind ...

The testing of nuclear weapons is suddenly a major topic of discussion after being largely dormant for three decades. Last week, Russia tested a nuclear-powered missile, but did not detonate an actual ...

A nuclear explosion creates immediate and long-lasting dangers, including intense heat, blast pressure, and radiation.