GW190521

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What Wikipedia says

GW190521 (initially S190521g) was a gravitational wave signal resulting from the merger of two black holes. It was possibly associated with a coincident flash of light; if this association is correct, the merger would have occurred near a third supermassive black hole.

Excerpt from the Wikipedia article “GW190521”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: R. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration), CC BY 4.0, via Wikimedia Commons.