Cosmic ‘Lighthouses’ That Beam Gamma Rays Could Reveal Gravitational Waves All Around Us

A team of astronomers have compiled 12.5 years of data from the Fermi Gammy-ray Space Telescope to form a gamma-ray pulsar timing array, a system of cosmic lighthouses that could help reveal ripples in spacetime.Since the first observation of gravitational waves in 2016, astronomers and astrophysicists have been trying to pin down the gravitational wave background, effectively the entire ocean of these waves in spacetime. Rapid rotations and collisions of the most massive objects in the uni