I was just googling on how does radio waves travel in space and stumbled upon this reddit post If sound can't travel through space, how can radio waves? and the idea that sound can't travel in space caught my attention.

Although it makes absolute sense that sound needs medium to travel from one end to another, has this actually been tested in space somehow? if "theoratically" I was able to shout in a void space would I look like this dog?

I still have my doubts.


closed as off-topic by TildalWave, Nathan Tuggy, Hohmannfan, Fred, GdD Feb 10 '16 at 10:19

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    $\begingroup$ If a tree falls in space... $\endgroup$ – duzzy Feb 10 '16 at 3:04
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    $\begingroup$ For the including myself part, see Could you hear the sound of your own body in the vacuum of space? Otherwise, and while this would likely be a question better fit for Physics and has no Space Exploration application, you wouldn't hear yourself shout because you wouldn't be able to produce any deliberate sound as the air left in your body that's now exposed to vacuum rushes out at the speed of sound. It would cause vibrations of your body, interpreted as sound by your inner ear as a short "pop" tho. $\endgroup$ – TildalWave Feb 10 '16 at 4:12
  • $\begingroup$ Mind that being suddenly exposed to vacuum of space would be a rather painful experience far less pleasant than someone punching you in your celiac plexus (abdomen). You'll have far greater problems than not hearing yourself shout, and about 10 seconds left to hear yourself think and find a way out of the unfortunate situation you're in. $\endgroup$ – TildalWave Feb 10 '16 at 4:16
  • $\begingroup$ Also related (answering why you wouldn't be able to produce coherent, deliberate sound with your vocal cords and "shout"): Would a woodwind instrument still play in outer space? $\endgroup$ – TildalWave Feb 10 '16 at 4:26
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    $\begingroup$ @razzak Only as the debris produced by the explosion start hitting the station. $\endgroup$ – TildalWave Feb 10 '16 at 4:50

You couldn't shout without air to expel from your lungs, so presumably you're in a space suit with air in it. Therefore you can hear yourself shout just fine. (Even if you didn't have a helmet's worth of air around your head, you'd hear the shout via vibration through your own body.)

The vibrations in the air, that make up the sound of your shout, would vibrate your helmet as well. If your helmet was touching another astronaut's helmet, that would conduct sound reasonably well, and that astronaut could hear you.

Another astronaut floating in space next to you wouldn't hear a thing, because there's no medium to conduct vibrations between you and them.

I don't know if astronauts have done this experiment; I'm sure the equivalent has been done in vacuum chambers on Earth.


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