evidence: NASA created a haunting audio clip of sound waves rippling out of a supermassive black hole, located 250 million light-years away. [...] The result (below), released by NASA in 2022, is a sort of unearthly (obviously) howling that, if we're honest, sounds not only spooky, but a little bit angry. [...] The sound waves were extracted radially, or outwards from the supermassive black hole at the center of the Perseus cluster, and played in an anti-clockwise 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.