We might not be able to hear sound in space, but that doesn't mean there isn't any. In 2003, astronomers detected something truly astonishing: acoustic waves propagating through the gas surrounding a supermassive black hole, 250 million light-years a
We wouldn't be able to hear them at their current pitch. Emanating from the supermassive black hole at the center of the Perseus cluster of galaxies, the waves include the lowest note in the Universe ever detected by humans – well below the limits of human hearing.
The sound waves were extracted radially, or outwards from the supermassive black hole at the center of the Perseus cluster, and played in an anticlockwise direction from the center, so that we can hear the sounds in all directions from the supermassive black hole at pitches 144 quadrillion and 288 quadrillion times higher than their original frequency.
Sound waves propagating through the intracluster medium is one mechanism whereby the intracluster medium can be heated, as they transport energy through the plasma.Because temperatures help regulate star formation, sound waves might therefore play a vital role in the evolution of galaxy clusters over long periods of time.
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