NASA created a haunting audio clip of sound waves rippling out of a supermassive black hole , located 250 million light-years away. The black hole is at the center of the Perseus cluster of galaxies, and the acoustic waves coming from it have been transposed up 57 and 58 octaves so they're audible to human hearing. The result, 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. Listen to the sounds in the