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Black hole merger 1.3 billion light-years away validates Hawking's area law

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A collision between two black holes, occurring 1.3 billion light-years from Earth, has provided the strongest observational proof yet for Stephen Hawking's black hole area theorem. First proposed roughly five decades ago, the law states that the surface area of a black hole can never decrease over time. Measurements of the merged black hole confirmed that its area grew in precise agreement with Hawking's theoretical predictions. The findings were made possible through a joint analysis of gravitational wave data by researchers working across the LIGO, Virgo, and KAGRA observatories. Scientists say the results strengthen the foundational principles underpinning modern physics and cosmology.

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