GW250114

When two black holes collide, they release gravitational waves that allow scientists to determine their mass and spin. In January 2025, LIGO detected GW250114, the clearest signal yet of a black hole merger, providing new insights into these mysterious cosmic giants. Credit: Maggie Chiang for Simons Foundation

Hawking was right: New data confirms black holes never shrink

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The sharpest and brightest gravitational signal ever measured, GW250114, allows the LIGO–Virgo–KAGRA collaboration to test Hawking's surface theorem and Einstein's prediction with unprecedented precision. Black holes "ring" after
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