GW231123 was a gravitational wave detected by the two LIGO detectors on 23 November 2023. As of 2025, it is the largest binary black hole merger yet detected, at 225+26 −43 solar masses for the final object. From Wikipedia
A new preprint floats a wormhole explanation for a 2019 signal that the authors describe as less favored than a standard black‑hole merger.
