Lena Torres
The idea that black holes might make a sound has intrigued people for years. In May 2022, NASA released a 34-second clip of what a black hole sounds like, causing a social media frenzy. The sound, a deep, low-pitched groaning, was created using electromagnetic data from the Perseus Galaxy Cluster, 240-250 million lightyears away. NASA's sonification of the black hole's pressure waves, which were translated into a note 57 octaves below middle C, audible to the human ear, has opened the door to further discoveries and inspired new studies. While the concept of recording audio from space is unusual, NASA stated that the belief that there is no sound in space is a popular misconception.
| Characteristics | Values |
|---|---|
| Possibility of black holes emitting sound | Yes, due to the acceleration of masses, in a similar way that accelerated charges emit electromagnetic waves (light) |
| Sound of a black hole | A low-pitched groaning, like a very creaky heavy door being opened again and again |
| Sound frequency | 57 octaves below middle C |
| Sound frequency after sonification | 57 and 58 octaves above the original frequency |
| Sound interpretation | An audio interpretation of the radiation and other matter surrounding the black hole |
| Sound impact | Brings emotion to otherwise esoteric and abstract data |
| Sound impact | Could create a useful crossover between analysis techniques for visual and audio data |
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What You'll Learn
NASA's audio clip of a black hole
In May 2022, NASA released an audio clip of a black hole for the first time in history. The 35-second clip features a low-pitched groaning sound, as if a heavy door were being opened repeatedly. The sound was created through sonification, a process that translates astronomical data into sound. In this case, the data came from the Chandra X-Ray Observatory, a space telescope that gathered electromagnetic data from the Perseus Galaxy Cluster, located about 240 million light-years away.
The original sound produced by the black hole was 57 octaves below middle C, a frequency inaudible to human ears. To make the sound audible, NASA raised the frequency quadrillions of times. The result is a sound that humans can hear and that adds an emotional element to the data.
The sound waves were extracted radially from the supermassive black hole at the centre of the Perseus cluster and played in an anti-clockwise direction. This allowed listeners to hear the sounds from all directions around the black hole. The pitch of the sound was also adjusted, with the original frequency of the waves being 144 quadrillion and 288 quadrillion times higher than the frequency in the audio clip.
NASA has continued to release new sonifications of black holes, including one of the black hole in Messier 87, or M87, which gained fame in the scientific community after the release of images from the Event Horizon Telescope (EHT) project in 2019. These sonifications provide a unique way to experience and understand the data collected by telescopes and observatories, bringing an emotional element to abstract information.
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The misconception that there is no sound in space
The idea that there is no sound in space is a common misconception. While it is true that much of space is a vacuum where sound waves cannot travel, certain areas, such as galaxy clusters, have enough hot gas to act as a medium for sound waves. This was proven by NASA in 2022 when it released a 35-second audio clip of a black hole located in the Perseus Galaxy Cluster, some 240-250 million light years from Earth. The sound, a low-pitched groaning or deep spectral moan, was created through a process called sonification, which involves translating astronomical data into sound. In this case, pressure waves sent out by the black hole caused ripples in the cluster's hot gas that could be translated into a note far below the range of human hearing. To make the sound audible, it was increased by 57 octaves, resulting in a note that is 144 quadrillion times higher than its original frequency.
The process of sonification can bring emotion to otherwise abstract data, creating a unique and powerful connection to the universe around us. It also has practical applications, particularly for those who are blind or have low vision, as it allows them to experience the wonders of space in a new way. Furthermore, the ability to analyse sound waves and gases in these extreme environments may inspire future studies and lead to new discoveries about black holes and the universe.
It is important to note that the sounds we hear from space are not direct recordings but rather audio interpretations of the data collected. The data is carefully converted from light into sound to ensure that the final product is scientifically accurate and makes sense to human ears. This involves mapping different types of data to different ranges of audible tones, with radio waves corresponding to the lowest tones, optical data to medium tones, and X-rays to the highest tones.
While the concept of recording sound from outer space may seem strange, it is clear that space is not completely silent. Through the use of advanced technology and creative translation methods, we can now hear the mysterious sounds of the universe, offering a fascinating glimpse into the secrets of black holes and the cosmos.
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Sonification of astronomical data
Sonification is the process of translating data into sound. In the context of astronomy, sonification involves turning astronomical data transmitted by telescopes into sound. This technique has been used to allow people to hear what a black hole sounds like.
In 2022, NASA released a 35-second audio clip of what a black hole sounds like. The sound was created using electromagnetic data picked up from the Perseus Galaxy Cluster, which is located about 240 million light-years away. The data had been collected nearly 20 years ago by the Chandra X-Ray Observatory. The sound of the black hole has been described as a low-pitched groaning, like a heavy door being opened repeatedly.
Sonification can be used to create soundscapes that bring emotion to data that would otherwise be abstract and difficult to understand. By translating data into sound, sonification makes astronomy more accessible, particularly for people who are blind or have low vision. For example, sonification has been used to help people with visual impairments understand the data gathered from monitoring the internal mechanics of stars, a field of science known as asteroseismology.
The process of sonification involves taking observational data from telescopes and translating it into corresponding frequencies that can be heard by the human ear. Different techniques are used based on the object and the data available. Sonified data used for educational purposes or exhibitions tend to be easy on the ear, sometimes reminiscent of bells or a glockenspiel.
Sonification can also help astronomers fine-tune their celestial observations. While there is technically no noise in deep space due to the lack of molecules for sound waves to travel through, telescopes can pick up internal and surface waves produced by hot turbulent gas in stars. Sonification allows astronomers to listen to the interplay between X-ray and optical information, providing a new way to interpret astronomical data.
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The black hole at the centre of the Perseus galaxy cluster
The Perseus galaxy cluster is the brightest cluster when observed in the X-ray band. It contains the radio source 3C 84, which is currently blowing bubbles of relativistic plasma into the core of the cluster. These are seen as holes in an X-ray image, as they push away the X-ray-emitting gas. The galaxy NGC 1275 is located at the centre of the cluster, where the X-ray emission is brightest.
In 2003, a team of astronomers led by Andrew Fabian at Cambridge University discovered one of the deepest notes ever detected. The sound waves appear to be generated by the inflation of bubbles of relativistic plasma by the central active galactic nucleus in NGC 1275. The sound waves were discovered in data from NASA's Chandra X-ray Observatory.
In May 2022, NASA reported the sonification of the black hole at the centre of the Perseus galaxy cluster. The sound waves were extracted in radial directions, that is, outwards from the centre. The signals were then resynthesized into the range of human hearing by scaling them upward by 57 and 58 octaves above their true pitch. The result is a sort of unearthly howling that sounds not only spooky but a little bit angry.
It is important to note that the sound we hear is not the black hole itself, but rather an audio interpretation of the radiation and other matter surrounding it. The sound waves detected by the Chandra X-ray Observatory allowed for the sonification project, which brought emotion to data that would otherwise be abstract.
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The science behind the sound
The sound waves were extracted in radial directions, moving outward from the center of the black hole. These signals were then resynthesized into the range of human hearing by scaling them upward by 57 and 58 octaves above their true pitch. This is because the original sound emitted by the black hole was far too low for humans to hear—about 57 octaves below middle C. By scaling up the pitch, the sound can be brought into an audible range for humans, creating a low-pitched groaning noise.
It is important to note that the sound we hear is not the black hole itself making a sound, but rather an audio interpretation of the data collected from the surrounding environment. The black hole causes pressure waves that create ripples in the cluster's hot gas, and these can be translated into a note. This process of converting data into sound can bring emotion to otherwise abstract and esoteric data, and it may even inspire new studies and techniques for analyzing both visual and audio data.
Additionally, the misconception that there is no sound in space stems from the fact that space is mostly a vacuum, where sound waves cannot propagate. However, in galaxy clusters like Perseus, there is enough hot gas to act as a medium for sound waves to travel through. Thus, while the black hole itself does not "make" a sound in the traditional sense, the interpretation of the data collected from its surroundings can provide valuable insights and a unique perspective on the universe.
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Frequently asked questions
Yes, black holes emit sound due to the acceleration of masses, similar to how accelerated charges emit electromagnetic waves. NASA has released audio clips of black holes, translating astronomical data into sound through a process called sonification.
NASA captures sound by detecting pressure waves and converting them into audible notes. In the case of the Perseus galaxy cluster's black hole, the sound was increased by 57 octaves to make it audible to the human ear.
The sound of a black hole has been described as a low-pitched groaning, similar to a creaky heavy door being opened repeatedly. Others have likened it to a deep spectral moan or an interstellar whale song.
Hearing black hole sounds adds an emotional element to the data, making abstract concepts more accessible and engaging. It also opens doors for further discoveries and inspires new studies in the field.
Black hole sounds may not directly reveal new information, but they can inspire future research and create a crossover between analysis techniques for visual and audio data. The study of sound waves and gases in extreme environments could lead to interesting findings.
