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sound is the vibration of matter that your ears are able to pick up with the eardrums and send to the brain which interprets what the sound is. Out in space if a vibration is caused by something there is no air for it to push along thus the vibration is limited to the thing doing the vibrating. If you were to have your space helmet against the thing making the noise or rather vibrating out in space you would hear it.

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13y ago
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Q: Why does sound do not travel in a vacuum?
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