Einstein's predictions mean rare 'gravitational lasers' could exist throughout the universe, new paper claims

Einstein predicted the existence of gravitational waves and stimulated emission of radiation.

New research has found that these effects can sometimes combine into rare and exotic "gravitational lasers" This could lead to a new way to detect one of the most elusive substances in the universe.

While powerful, these gravitational lasers would be very rare, since they would point away from Earth .