Until recently, gravitational waves could have been a figment of Einstein’s imagination. Before they were detected, these ripples in spacetime existed only in the physicist’s general theory of ...

Two black holes spiraled into each other in a spectacular collision 1.3 billion years ago. The black holes in a galaxy far, far away then merged, vibrated and produced gravitational waves, a type of ...

A new type of gravitational wave detector running in Western Australia has recorded two rare events that might be signals of dark matter or primordial black holes. These high-frequency gravitational ...