<p>There is sound, but you cannot hear it. </p>

<p>1) There is no sound in space:
<a href="https://www.youtube.com/watch?v=ce7AMJdq0Gw" rel="nofollow noreferrer">This</a> shows how sound gets fainter in an evacuated glass jar. The same happens with an explosion (or a shout) in space - there is no air to transmit the pressure waves, so no sound.</p>

<p>2) There is sound in space:
The interstellar and even intergalactic medium is not completely empty, even though it is much more empty than the best vacuum we can create on earth. Nonetheless, there can be pressure waves in those media.</p>

<p><a href="https://i.sstatic.net/Dvpai.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Dvpai.jpg" alt="The bullet cluster"></a> <br />(The bullet cluster, taken from NASA's <a href="http://apod.nasa.gov/apod/ap060824.html" rel="nofollow noreferrer">APOD</a>)</p>

<p>This image shows the mass distribution of two colliding galaxy clusters in blue, and the X-ray gas in red. The galaxies in the clusters have passed through each other without much disturbance, but the intra-cluster gas has collided. The red cone to the right of the centre looks a lot like the sonic boom familiar from aircraft.</p>

<p>For more regular sound waves (repeating pattern as opposed to the one-off of an explosion), you might find those in the interplanetary gas / solar wind of oscillating stars (RR Lyrae or Delta Cephei type stars). I am not sure if anyone has ever measured this.</p>

<p>At any rate, while human ears can pick up sound in the range of ca. $10^2$ to $10^4$ Hz, these sound waves would have a much much lower frequency. Also, the force exerted by these pressure waves on a human ear would be much too small to register. </p>

CC BY-SA 3.0
2016-08-08T10:18:02.440Z
2016-08-08T21:03:45.840Z
2016-08-08T21:03:45.840Z
Alex
<p>As there is no air in space for sound to travel through, you can't hear anything outside of the small bubble you're in, e.g. space suit, space ship.</p>

<p>There is however 'noise' in the electromagnetic spectrum which can be picked up by electronic equipment, with this being an example <a href="https://www.youtube.com/watch?v=suSNye-3tVo" rel="nofollow">https://www.youtube.com/watch?v=suSNye-3tVo</a></p>

CC BY-SA 3.0
2016-08-08T12:57:29.557Z
But there's an Air in Space Museum.
userLTK
CC BY-SA 3.0
2016-08-08T06:28:14.263Z
2016-08-08T06:28:14.263Z
Tanenthor
<p>Is our universe noisy or silent? Can people hear them? When astronauts are out of the Earth and near an explosion, can they hear its noise. </p>

CC BY-SA 3.0
2016-08-08T07:27:05.150Z
Yes, yes there is! Not sound that humans can hear, but since sound is nothing but compressions in gas, and since there _is_ gas in space (albeit very dilute), there _is_ sound in space. Espacially in cosmology, these sound waves play a very significant role. Check out [this post at physics.SE](http://physics.stackexchange.com/questions/162184/what-is-the-speed-of-sound-in-space/162210#162210)
pela
CC BY-SA 3.0
2016-08-08T17:13:05.127Z
Also see [this question at physics.SE](http://physics.stackexchange.com/questions/48574/how-can-a-black-hole-produce-sound).
David Hammen
<universe><space>
Are there any sounds in space?
user13697
# Are there any sounds in space?

(Asked by: username_0 on 2016-08-08)

Is our universe noisy or silent? Can people hear them? When astronauts are out of the Earth and near an explosion, can they hear its noise.

**Tags:** universe, space
> **Comments:**
> **username_1**: Yes, yes there is! Not sound that humans can hear, but since sound is nothing but compressions in gas, and since there _is_ gas in space (albeit very dilute), there _is_ sound in space. Espacially in cosmology, these sound waves play a very significant role. Check out [this post at physics.SE](http://physics.stackexchange.com/questions/162184/what-is-the-speed-of-sound-in-space/162210#162210)  
> **username_2**: Also see [this question at physics.SE](http://physics.stackexchange.com/questions/48574/how-can-a-black-hole-produce-sound).  

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## 2 answers

### Answer by username_3 on 2016-08-08. Score: 6

There is sound, but you cannot hear it.

1) There is no sound in space:
[This](https://www.youtube.com/watch?v=ce7AMJdq0Gw) shows how sound gets fainter in an evacuated glass jar. The same happens with an explosion (or a shout) in space - there is no air to transmit the pressure waves, so no sound.

2) There is sound in space:
The interstellar and even intergalactic medium is not completely empty, even though it is much more empty than the best vacuum we can create on earth. Nonetheless, there can be pressure waves in those media.

[![The bullet cluster](https://i.sstatic.net/Dvpai.jpg)](https://i.sstatic.net/Dvpai.jpg)   
(The bullet cluster, taken from NASA's [APOD](http://apod.nasa.gov/apod/ap060824.html))

This image shows the mass distribution of two colliding galaxy clusters in blue, and the X-ray gas in red. The galaxies in the clusters have passed through each other without much disturbance, but the intra-cluster gas has collided. The red cone to the right of the centre looks a lot like the sonic boom familiar from aircraft.

For more regular sound waves (repeating pattern as opposed to the one-off of an explosion), you might find those in the interplanetary gas / solar wind of oscillating stars (RR Lyrae or Delta Cephei type stars). I am not sure if anyone has ever measured this.

At any rate, while human ears can pick up sound in the range of ca. $10^2$ to $10^4$ Hz, these sound waves would have a much much lower frequency. Also, the force exerted by these pressure waves on a human ear would be much too small to register.


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### Answer by username_4 on 2016-08-08. Score: 1

As there is no air in space for sound to travel through, you can't hear anything outside of the small bubble you're in, e.g. space suit, space ship.

There is however 'noise' in the electromagnetic spectrum which can be picked up by electronic equipment, with this being an example <https://www.youtube.com/watch?v=suSNye-3tVo>

> **Comments:**
> **username_5**: But there's an Air in Space Museum.  

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