It’s the largest merger ever detected.
The merger signal, called GW190521, lasted only a tenth of a second—but scientists immediately realized it was extraordinary in comparison to the low chirp of two colliding black holes LIGO detected in 2015, which confirmed Einstein’s ineffable notions on space-time. “It’s the biggest bang since the Big Bang that humanity has ever observed,” says Alan Weinstein, an astronomer at the California Institute of Technology who was part of the study.
Up until now, scientists have been able to detect and indirectly observe black holes in two different size ranges: stellar-mass black holes, which measure from a few solar masses up to tens of solar masses, and supermassive black holes that range from hundreds of thousands to several billions of times the mass of our sun. However, astronomers that detected GW190521 witnessed the birth of a special breed of black hole: an “intermediate-mass” black hole.
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