Does sound really cannot travel through vacuum?

Replies

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  Jeffrey Arulraj

  Hey you forgetting some thing all space crafts have some air in them or else the astronauts can't remove their helmets inside the shuttle
  
  That is enough for Sound to travel and thus they are able to talk between each other
  
  At the same time when an astronaut goes for Space Walk they use Tx Rx pair to communicate between themselves as only EM waves travel in Vaccum
  
  #-Link-Snipped-#
  
  Tells why sound does not travel in Vaccum it's density is almost 0 and so the sound velocity is beyond human perception
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  Sindhu Chowdary

  You mean to say that here both EM waves and sound waves are involved during their speech.is it?
  
  Then thanks a lot , that cleared my doubt.
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  Jeffrey Arulraj

  EM for space walks and Sound waves inside the Shuttle
  
  Hope I managed to clear our doubts 😁