sohkamyung, "According to the paper, the two events [gravitational wave and another type of astrophysical signal] may have originated from two black holes colliding while inside of the extreme environment surrounding a much larger supermassive black hole known as an active galactic nucleus, triggering a bright electromagnetic flare."
https://astrobites.org/2024/01/20/black-holes-all-the-way-down/
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