Sounds Of The Universe

Have you ever wondered what black holes sound like? Humans can't get close enough to a black hole to hear any sounds that they might make and even if we could, do not have the ability to hear frequencies far outside of our range. 

But black holes do make sounds. And some scentists have been boosting the frequencies black holes make to levels that are audible to humans. The results are fascinating. 

In space you can’t hear a black hole scream, but apparently you can hear it sing. In 2003 astrophysicists working with NASA’s orbiting Chandra X-ray Observatory detected a pattern of ripples in the X-ray glow of a giant cluster of galaxies in the constellation Perseus. They were pressure waves — that is to say, sound waves — 30,000 light-years across and radiating outward through the thin, ultrahot gas that suffuses galaxy clusters. 

They were caused by periodic explosions from a supermassive black hole at the center of the cluster, which is 250 million light-years away and contains thousands of galaxies. With a period of oscillation of 10 million years, the sound waves were acoustically equivalent to a B-flat 57 octaves below middle C, a tone that the black hole has apparently been holding for the last two billion years. 

Astronomers suspect that these waves act as a brake on star formation, keeping the gas in the cluster too hot to condense into new stars. The Chandra astronomers recently “sonified” these ripples by speeding up the signals to 57 or 58 octaves above their original pitch, boosting their frequency quadrillions of times to make them audible to the human ear. As a result, the rest of us can now hear the intergalactic sirens singing. 

Through these new cosmic headphones, the Perseus black hole makes eerie moans and rumbles that reminded this listener of the galumphing tones marking an alien radio signal that Jodie Foster hears through headphones in the science fiction film “Contact."

 
As part of an ongoing project to “sonify” the universe, NASA also released similarly generated sounds of the bright knots in a jet of energy shooting from a giant black hole at the center of the humongous galaxy known as M87. These sounds reach us across 53.5 million light-years as a stately succession of orchestral tones.

There is something awe-inspiring to me that sound and rhythm are apparently woven into the universe. It makes you think.

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