First gravitational wave detection (2015)
On September 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected GW150914, the ripple from two black holes — about 29 and 36 solar masses — merging 1.3 billion light-years away. It was the first direct evidence that black holes collide and merge.
LIGO's detection opened gravitational-wave astronomy, adding a new way to observe the universe.
It confirmed binary black hole mergers as a real phenomenon and set up studies of them at every scale.
J0148-4214's central pair will merge within a few hundred million years, producing the kind of gravitational waves that future space-based observatories are built to catch.
