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In September of 2003, astronomers using NASA's Chandra X-ray Observatory discovered sound waves being emitted from a supermassive black hole. The sound is the deepest ever detected from any object in the Universe. The black hole resides in the Perseus cluster of galaxies located 250 million light years from Earth. In 2002, astronomers obtained a deep Chandra observation that shows ripples in the gas filling the cluster. These ripples are evidence of sound waves that have traveled hundreds of thousands of light years away from the cluster's central black hole.
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