Space Artist's concept of a black hole accreting a companion. Astronomers have found an explosion of a cloud of dust around a black hole that was 10 times brighter than any supernova and has lasted more than 3 years. It's the largest cosmic explosion astronomers have ever seen. Image via John A. Paice/ Royal Astronomical Society . On May 11, 2023, the Royal Astronomical Society announced that a team of astronomers has found the largest cosmic explosion ever seen. Shining 10 times brighter than any known supernova .

https://earthsky.org/space/largest-cosmic-explosion-at2021lwx-cloud-black-hole/

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