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

A new study combining two of Albert Einstein's famous predictions suggests that ripples in space-time can combine into 'gravitational lasers', firing out of black holes in random directions across the cosmos. Among his many theoretical insights, Albert Einstein predicted the existence of two phenomena in our universe that have since been proved: gravitational waves and the stimulated emission of radiation. New research has found that these effects can sometimes combine into rare and exotic "gravitational lasers" — possibly leading to a new way to detect one of the most elusive substances in the universe.