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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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