Massive black hole collisions can ‘chirp’ twice, revealing their shape – CNET

National Science Foundation
There’s still a lot we don’t know about black holes — they’re mysterious, gigantic and all round puzzling — but it turns out they’re also one more thing: noisy.
When black holes collide with each other they sound off multiple “chirps,” emitting a gravitational waves or signals that can be used to narrow down their size and shape, according to a study from the ARC Centre of Excellence for Gravitational Wave Discovery, published in Communications Physics.
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