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International Collaboration

University of Toronto Astronomers EHT Collaboration LIGO-Virgo-KAGRA Astrophysical Research

Twin Black-Hole Mergers Display Extreme Spins, Strengthen Einstein’s Theory, and Point to Second-Generation Origins

Peer-reviewed analyses turn two late-2024 gravitational-wave detections into some of the sharpest tests of general relativity to date.

Five-Image Einstein Cross Points to Massive Dark Matter Halo