In 2019, a supermassive black hole in a galaxy 300 million light-years away woke up. Now, it’s puzzling astronomers with an unexpected slowdown in its X-ray bursts. The post A Black Hole’s Puzzling X-Ray Bursts appeared first on Sky & Telescope.
A Black Hole’s Puzzling X-Ray Bursts
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May 11, 2026 •
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