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Mittwoch, 24. August 2022 - 07:02

Astronomie - Terrifying ghosts or new Björk? What Nasa’s black hole recording sounds like

24.08.2022

black-hole-sound

Eerie audio emanating from the Perseus cluster reminds social media users of sci-fi films and hungry stomachs

220823-YS-Black hole audio.00 00 00 00.Still001 — Nasa releases audio of what a black hole 'sounds' like — video

If you were content to go through life without knowing what a supermassive black hole sounds like (perhaps because of its scary name or a desire not to think about endless darkness), your luck has run out.

On Sunday Nasa released an audio clip that represents actual sound waves emanating from the enormous black hole at the centre of the Perseus galaxy cluster, which is more than 200m light years away.

The sound is edited so that it can be heard by human ears. Nasa mixed it with “other data” and amplified it, saying that the idea that there is no sound in space was a misconception.

“The misconception that there is no sound in space originates because most space is a ~vacuum, providing no way for sound waves to travel,” Nasa tweeted.

“A galaxy cluster has so much gas that we’ve picked up actual sound. Here it’s amplified, and mixed with other data, to hear a black hole!”

The clip, which sounds something like a cosmic growl or an ominous wind tunnel, captured the internet’s attention, and many said it sounded exactly how they imagined a supermassive black hole would sound.

Others turned to images of horror to describe it, and some commented on the sound’s ethereal nature.

“Somehow you just knew a black hole was going to sound like terrifying ghosts instead [of] gentle ocean waves,” Twitter user Asher Honickman wrote.

Some turned to pop culture to describe it, with references to the sci-fi cult classic Event Horizon and the horror film Silent Hill. One Twitter user thought it sounded like Pink Floyd’s Echoes, and another joked that it was new music from the Icelandic singer Björk.

And one section of the internet felt it sounded more like bodily functions than anything else. “This sounds just like my stomach at 6.30pm when the early evening shows have wrapped. #Hungryinspace,” Natasha Stenbock wrote.

The sound itself comes from Nasa’s Chandra X-ray Observatory, and was actually released in May.

The agency described it then as a result of pressure waves sent out by the black hole, saying it was a whopping 57 octaves below middle C, which means scientists had to raise the frequency quadrillions of times to make it audible.

“Astronomers discovered that pressure waves sent out by the black hole caused ripples in the cluster’s hot gas that could be translated into a note — one that humans cannot hear some 57 octaves below middle C,” they said in a statement.

“In some ways, this sonification is unlike any other done before… because it revisits the actual sound waves discovered in data from NASA’s Chandra X-ray Observatory.”

Quelle: The Guardian

Astronomie - Terrifying ghosts or new Björk? What Nasa’s black hole recording sounds like

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