LIGO has spotted another gravitational wave just after turning back on

April 10, 2019

LIGO is back at it. Having just turned back on after months of upgrades on 1 April, the Laser Interferometer Gravitational-Wave Observatory has already spotted another pair of black holes colliding. Gravitational waves are ripples in space-time that occur whenever massive objects move, like the wake behind a boat travelling across a lake.