The world’s best clocks may be sensitive to an odd mix of quantum and relativistic effects that would stretch time and test ...

New observations of two black holes merging have confirmed predictions made decades ago by Albert Einstein, Stephen Hawking, ...

Interference from human activity has always been a sticking point in astronomical observations. Radio astronomy is ...

Physicists are eyeing charged gravitinos—ultra-heavy, stable particles from supergravity theory—as possible Dark Matter ...