More like a 'bang' than a 'chirp': Scientists detect gravitational wave from massive merger of 2 black holes - USA TODAY

The merger of two black holes, estimated to have occurred about 7 billion years ago, is the largest observed in gravitational waves, researchers say. https://www.usatoday.com/story/tech/science/2020/09/02/researchers-gravitational-wave-massive-merger-2-black-holes/5692188002/