Lena Torres
Sound is carried by atoms and molecules, which are virtually non-existent in space. This means that sound cannot travel in space because there is no medium for it to move through. However, there are parts of space that are not empty, and sound waves can travel through stars, encoding themselves in the light that we see from them. In 2022, NASA released an audible recording of sound in space, representing the way a massive black hole stirs up plasma in the Perseus galaxy cluster.
| Characteristics | Values |
|---|---|
| Does sound travel in space? | No, sound cannot travel in space as it is a vacuum with almost no matter. |
| Speed of sound in space | Not applicable |
| Sound in space near stars | Sound waves can travel through stars and are encoded in the light we see from them. |
| Sound in space near black holes | Sound waves can be detected near black holes in the form of gravitational waves or very long-wavelength sound waves in the surrounding plasma. |
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What You'll Learn
Sound waves need a medium to travel
Sound waves cannot travel in space because they require a medium—such as a solid, liquid, or gas—to move through. In space, there is no air or water, and it is a vacuum that contains almost no matter. Therefore, there is no medium for sound waves to travel through.
Sound is a mechanical wave that requires a medium to propagate. It is created when a source, like a drum, vibrates and causes the surrounding air molecules to vibrate, generating a sound wave that travels through the air. This process is known as oscillation, where energy is transferred through a medium. However, in a vacuum, there is no medium for these vibrations to travel through, and sound cannot be conducted.
While space is a vacuum, it is not a perfect one. It contains some particles, primarily hydrogen atoms, but they are extremely sparse. In a cubic centimeter of space, there are only about five particles, compared to the air on Earth, which has a density of 10 billion billion particles per cubic centimeter. The density of particles in space is so low that they are usually not close enough to transmit audible sound waves.
However, it is important to note that sound waves can exist in space under certain conditions. For example, NASA recorded sound waves from a black hole in the Perseus galaxy cluster. The black hole itself did not emit sound, but the diffuse plasma around it carried very long-wavelength sound waves. These sound waves had an extremely low frequency, far below the range of human hearing. But when the frequency was raised to an audible range, it produced a chilling sound, like a black hole growling in deep space.
Additionally, sound waves can travel through stars, and this is an area of study called astroseismology. While there is no sound in the vacuum of space, sound waves can propagate through the dense matter of stars and encode themselves in the light that we see from them.
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Space is a vacuum with almost no matter
Sound is produced when molecules in a medium (solid, liquid, or gas) vibrate, causing those neighbouring them to vibrate and so on, carrying the sound through the medium. This is how sound travels through the air. However, space is a vacuum, which means it contains almost no matter. In fact, space is mostly empty, with very low particle density. Beyond the Earth and its atmosphere, there are about five particles in a typical cubic centimetre—the volume of a sugar cube—which is mostly hydrogen atoms. This is 10 billion billion times less dense than the air we breathe.
Since sound waves cannot travel without a medium, they cannot travel through space. Therefore, if you were to yell in space, your voice would not carry, and the energy you expended to make the sound would remain in your mouth or be transferred into the gases you are expelling as heat. However, while space is a good enough vacuum that normal sound can't travel through it, it is not a perfect vacuum, and it does contain some particles. In 2022, NASA released an audible recording of sound in space. It used X-ray data to make a recording of the way a massive black hole stirs up plasma in the Perseus galaxy cluster, 250 million light years from Earth. The sound was far too low a frequency for the human ear to hear, so it was raised to an audible range.
While it is true that there is almost no matter in space, there are parts of space that are not empty. For example, sound waves can travel through stars, and these sound waves encode themselves in the light that we see from stars. This is a whole area of research called astroseismology. Furthermore, gravitational waves have been described as how we "hear" the universe, in the same way that telescope-based astronomy is how we see it. These waves can be detected using a laser interferometer, and if you were close enough and had sensitive enough ears, you could feel the motion in your eardrum.
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Sound can be detected from low-density matter in space
Sound is carried by atoms and molecules. In space, with no atoms or molecules to carry a sound wave, there’s no sound. Space is a vacuum, lacking the matter to carry sound waves. No sound in space means no echoes.
However, while space is a near-perfect vacuum, it is not a perfect vacuum. There are some particles floating through it, and the density of these particles varies. In 2022, NASA released an audible recording of sound in space. It used X-ray data to represent the way a massive black hole stirs up plasma in the Perseus galaxy cluster, 250 million light years from Earth. The black hole itself emits no sound, but the diffuse plasma around it carries very long-wavelength sound waves.
The natural sound is far too low a frequency for the human ear to hear, 57 octaves below middle C. However, after raising the frequency to the audible range, the result is the sound of a black hole growling in deep space.
Sound waves can also travel through stars, and these sound waves encode themselves in the light that we see from stars. This is a whole area of research called astroseismology.
In conclusion, while space is mostly a vacuum, some sounds can be detected from extremely low-density matter in deep space.
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Gravitational waves allow us to hear space
Sound does not travel in space because it is a vacuum with almost no air, water, or matter for it to move through. However, gravitational waves have brought us one step closer to hearing the sounds of space.
Gravitational waves are waves of stretching and shrinking space caused by the acceleration of masses. They were predicted by Einstein's theory of general relativity, which states that they should travel at the speed of light. These waves carry information about their dramatic origins and provide a new way to observe the universe, allowing us to "hear" space for the first time.
Gravitational waves were first detected in 2015 by the LIGO and VIRGO detectors, which use laser interferometry to measure gravitational-wave-induced motion between separated 'free' masses. This detection opened a new era in astronomy, allowing us to study the universe in a completely new way. Since then, gravitational wave detectors have continued to improve in sensitivity, increasing the volume of the universe we can listen to.
While gravitational waves are not audible to the human ear, they can be recorded and sped up to create seismic sounds that humans can hear. These sounds provide valuable data about the universe and allow us to make predictions about what we might hear as detection technology improves. In the future, gravitational wave detectors in space will be able to listen to gravitational waves at much lower frequencies, expanding our horizon to encompass half of the visible universe.
In conclusion, gravitational waves have revolutionized our understanding of the universe by allowing us to "hear" space for the first time. With ongoing improvements in detection technology, we can look forward to hearing even more of the universe's secrets in the years to come.
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Sound waves can travel through stars
Sound waves cannot travel through empty space because there is no medium for the sound to travel through. Sound waves require atoms and molecules to carry them through solids, liquids, or gases. Space is a near-vacuum, meaning it contains almost no matter.
However, there are parts of space that are not empty. For example, sound waves can travel through stars. Stars are not empty and are composed of matter, which allows sound waves to pass through them. Stars are in a constant state of vibration, with thousands of different sound waves bouncing around inside them at any given moment. These sound waves encode themselves in the light that we see from stars. This area of research is called astroseismology.
The bigger the star, the longer it takes sound waves to travel in its interior. In the Sun, a typical wave completes one cycle in five minutes. Any given wave lasts a few days in Sun-like stars, but because new waves are constantly forming, stars are always vibrating. Red giants, which are dozens of times bigger than the Sun, have lower-frequency waves that can propagate for weeks to months.
While humans cannot hear these sound waves, telescopes sensitive to stellar vibrations allow scientists to study them. By "listening" for stellar sound waves with telescopes, scientists can determine what stars are made of, how old they are, their size, and how they contribute to the evolution of our Milky Way galaxy.
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Frequently asked questions
No, sound does not travel in space because it is a vacuum and has no medium for the vibrations to travel through.
Sound needs a medium (solid, liquid, or gas) to travel. In space, there are no atoms or molecules to carry sound waves.
In 2022, NASA released an audible recording of sound in space. It used X-ray data to represent the way a massive black hole stirs up plasma in the Perseus galaxy cluster, 250 million light years from Earth.
