synapse snaps on Instagram: "The Terrifying Sound of a Black Hole (NASA Audio) We are told that "in space, no one can hear you scream." That is because space is usually a vacuum. But the Perseus Cluster is different. It is so dense with gas that sound waves can actually travel through it. NASA detected pressure waves rippling from the central supermassive black hole. These are real sound waves. It is singing a B-Flat note, 57 octaves below middle C. NASA pitched it up so human ears could finally

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