Nova Zhang
Sound travels through air when air molecules near a source bump into their neighbours, which in turn bump into their neighbours, and so on, causing the sound to move through the air. However, space is a vacuum, which means it contains almost no matter. As sound is carried by atoms and molecules, and there are almost none in space to carry a sound wave, sound cannot travel in space. However, some sources suggest that sound can be detected in space through gravitational waves, which are ripples in spacetime.
| Characteristics | Values |
|---|---|
| Sound travel in space | No, space is a vacuum with almost no matter, hence no atoms or molecules to carry sound waves |
| Detection of sound in space | Possible through gravitational waves, which move everything in space back and forth |
| Sound in low-density matter in deep space | Possible, as some sounds can be detected from extremely low-density matter |
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What You'll Learn
Sound waves require a medium to travel through
Matter in deep space is spread out, making it impossible for sound waves to travel. Sound waves need a medium such as solid, liquid, or gas to move through. While space is a good enough vacuum that normal sound cannot travel through it, it is not a perfect vacuum. There are some particles floating through it, mostly hydrogen atoms. However, the density of these particles is extremely low, and the matter found in the vast voids of space is in a physical state called plasma, where electrons are separated from protons. In a plasma, the physics of sound waves gets complicated.
Although there may be some particles in space, the distance between them is so great that sound waves cannot effectively travel through them. Sound moves through air by molecules bumping into their neighbors, which then bump into others, creating a wave. In space, there are no neighboring molecules for the sound waves to bounce off of and travel through.
Despite the absence of sound in space, it is possible to "hear" space through gravitational waves. Gravitational waves are ripples in spacetime that move everything in space back and forth by a tiny amount. While these waves are not audible to the human ear, they can be detected by laser interferometers such as LIGO, and in theory, if one's ears were sensitive enough, they could feel the motion in their eardrum caused by these gravitational waves.
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Space is a near-vacuum
However, space is not a perfect vacuum and does have some particles floating through it. Beyond the Earth and its atmosphere, there are five particles in a typical cubic centimetre—the volume of a sugar cube—that are mostly hydrogen atoms. In contrast, the air we breathe is 10 billion billion (10^19) times denser. The density decreases with distance from the Sun, and in the vast voids between galaxies, it is a million times lower. The voids of space are kept very hot by radiation from stars, and the spread-out matter found there is in a physical state called plasma. Plasma is a gas in which electrons are separated from protons, and the physics of sound waves in plasma becomes complicated.
While sound cannot travel through space, it is possible to 'hear' space through gravitational waves. Gravitational waves are ripples in spacetime that move everything in space back and forth by a tiny amount. If you were close enough and had sensitive enough ears, you could feel this motion in your eardrum. Laser interferometers like LIGO can detect these vibrations.
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Gravitational waves allow us to 'hear' space
Sound cannot travel through space because it is a vacuum, almost devoid of matter. Sound waves require atoms and molecules to carry them, and with no molecules present, sound cannot travel.
However, gravitational waves allow us to 'hear' space. Gravitational waves are distortions in the fabric of space and time, caused by the movement of massive objects. They are similar to sound waves in air or ripples on the surface of water when a rock is thrown in. Gravitational waves are invisible and cannot be seen, but they can be heard with the right instrument.
Albert Einstein predicted the existence of gravitational waves in 1916, and the first proof of their existence was found in 1974 by astronomers Russell Hulse and Joseph Taylor. They discovered a binary pulsar 21,000 light-years from Earth, which was a system that general relativity predicted should radiate gravitational waves. The first detection of gravitational waves was made in 2015 by the LIGO observatory, which sensed undulations in spacetime caused by two colliding black holes.
Gravitational waves are like ripples in spacetime, caused by some of the most violent and energetic processes in the universe. They move at the speed of light and do not require a medium to travel through, unlike sound waves. The detection of gravitational waves has allowed astronomers to study the mergers of neutron stars and black holes and gain a better understanding of the universe's foundation.
By studying gravitational waves and multi-messenger astronomy, we can hear the universe in a whole new way. We can detect the deep rumble of merging supermassive black holes and the zippy chirps of colliding neutron stars, creating a symphony of cosmic sounds.
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The absence of sound in space
Space is often described as a vacuum, which means it contains very little matter. Sound travels through the vibration of atoms and molecules; in the absence of a significant number of atoms or molecules in space, sound waves cannot propagate. On Earth, sound moves through the air as air molecules bump into each other, transmitting the sound wave. However, in the vacuum of space, there are no air molecules to facilitate this process, rendering sound transmission impossible.
The concept of sound in space becomes more intricate when considering the presence of extremely low-density matter in deep space. While space is mostly empty, it is not a perfect vacuum, and some particles, predominantly hydrogen atoms, are present. In these regions of low-density matter, some sounds can be detected. The physics of sound waves in this context, where matter exists as a plasma, becomes more complex.
Despite the absence of sound as we commonly understand it, space is not entirely silent. Gravitational waves, or ripples in spacetime, provide a means for the "sound" of the universe to be heard. Through the use of instruments like laser interferometers, these gravitational waves can be detected, offering a way to "hear" the universe beyond the reach of traditional telescope-based astronomy. Thus, while the conventional notion of sound is absent in space, the detection of gravitational waves provides a unique perspective on the auditory nature of the cosmos.
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The matter in deep space
Space is a near-perfect vacuum, which means it contains almost no matter. However, it is not entirely devoid of matter. Intergalactic space, which takes up most of the volume of the universe, is filled with ultra-low-density matter. This matter is in the form of a plasma, a gas in which electrons are separated from protons. The plasma between galaxies is thought to account for about half of the baryonic (ordinary) matter in the universe, with a number density of less than one hydrogen atom per cubic meter. The remaining baryonic matter makes up the stars, planets, and cold gases inside galaxies.
The low density of matter in outer space means that electromagnetic radiation, including light, can travel great distances without being scattered. This is why we are able to observe distant galaxies and other astronomical objects. The mean free path of a photon in intergalactic space is about 1023 km, or 10 billion light years.
The temperature of matter in deep space is quite low, at around 2.7 Kelvin (-270 °C or -455 °F). However, the gases that are present can be much hotter, with temperatures in the thousands of degrees Kelvin or Celsius. Despite the high temperatures, the low density of the gases means that there is not enough heat to cause any noticeable effects.
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Frequently asked questions
Sound travels when air molecules bump into their neighbours, which then bump into their neighbours, and so on. In space, there are no molecules to carry sound waves, so technically, sound doesn't travel in space.
Yes, that is true. The tagline from the 1979 movie "Alien" is correct—in space, there is no sound or echo.
Gravitational waves are ripples in spacetime, and they can be detected using a laser interferometer like LIGO. If your ears were sensitive enough, you could feel these waves in your eardrum. So, in a way, we can "hear" space through gravitational waves.
