Deep in the core of most galaxies, hidden by spinning clouds of gas and dust, black holes spin like cosmic engines. These ...

Defense officials are taking a step back from one of its most ambitious research goals: launching a massive neutral-particle-beam generator, essentially a ray gun, into space to fry the electronics of ...

Astronomers propose an experiment that may close the last major loophole of Bell's inequality -- a 50-year-old theorem that, if violated by experiments, would mean that our universe is based not on ...