Hear the Weird Sounds of a Black Hole Singing


In space you can’t hear a black hole scream, but apparently you can hear it sing. In 2003 astrophysicists working with NASA’s orbiting Chandra X-ray Observatory detected a pattern of ripples in the X-ray glow of a giant cluster of galaxies in the constellation Perseus. They were pressure waves — that is to say, sound waves — 30,000 light-years across and radiating outward through the thin...

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