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...

Ten years of gravitational waves

On September 14th 2015, ten years ago, a signal arrived on Earth that was generated by a pair of black holes. After spiralling around each other at impressive speeds, they had merged, releasing an enormous amount of energy. To reach us, the signal had travelled some...

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