NASA shares audio recording from supermassive black hole 250 million light-yrs away

NASA has shared an audio clip capturing sound waves from a supermassive black hole 250 million light-years away. The black hole is located at the heart of Perseus galaxy cluster. The original note, identified in 2003, is a B-flat, situated over 57 octaves below middle C. The sound waves were extracted radially and then played anti-clockwise to cover all directions.