LIGO, Virgo and KAGRA complete the richest observation run to date

Today the international LIGO-Virgo-KAGRA Collaboration announces the completion of the fourth observation campaign (called O4) of the international network of gravitational wave detectors. Launched in May 2023, the campaign ends today after a period of coordinated...

LIGO, Virgo and KAGRA observed “second generation” black holes for the first time

A pair of very special black hole mergers, detected just one month apart in late 2024, is improving how scientists understand the nature and evolution of the most violent deep-space collisions in our universe. Some features of these mergers point toward the...

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