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NASA just released the sound from a black hole, and it's as cool as it is eerie.NASA Exoplanets on Twitter unveiled audio from the galaxy cluster Perseus, 240 million lightyears away from Earth.The sound waves were actually previously identified by astronomers but have been made audible for the first time.Scientists say the black hole sends out pressure waves that cause ripples in the hot gas, which can be translated into a note.Video: Pluto demoted to dwarf planet in 2006To be clear, though, the actual note is one humans can't hear. It's about 57 octaves below middle C.But the people at NASA say they shifted the note so we could hear it — amplified it and then mixed it with other data they have about black holes.