The Black Hole That Plays One Endless Note #space #astronomy #blackholes

About 250 million light-years away in the Perseus galaxy cluster, NASA's Chandra X-ray Observatory mapped something no telescope had captured before. In 2003, astronomers found vast ripples spreading through the cluster's hot gas — pressure waves driven by the supermassive black hole at its center. Translated into a musical pitch, those waves form a single deep note: a B-flat roughly 57 octaves below middle C, far too low for any human ear. It is the lowest note ever detected in the universe. Sound needs a medium to travel, so it cannot move through empty space — but the cluster is filled with thin, hot gas, and through that gas the note has been sounding for millions of years.

Sources: NASA Chandra X-ray Observatory press release and science summary on the Perseus cluster sound waves (2003). NASA / Chandra mission science. Peer-reviewed studies of pressure waves in the Perseus cluster intracluster medium.

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