The LIGO-Virgo-KAGRA (LVK) Collaboration has published GWTC-4, its fourth gravitational-wave transient catalog, covering detections from the first segment of its fourth observing run (May 2023–January 2024). The catalog adds 128 new gravitational-wave candidates, more than doubling the previous total of 90. Notable detections include the heaviest black hole binary ever observed (each ~130 solar masses), a binary with the highest inspiral spin (~40% the speed of light), and an unusually asymmetric pair. The data is being used to test Einstein's general relativity, study black hole population properties, and independently estimate the Hubble constant at ~76 km/s/Mpc.
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