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Any sound waves use a medium to travel along (on Earth the medium is Air, Water or any Solid.

A Vacuum, like Space, does not contain any particles; therefore sound waves have no medium through which to travel and thus Sound will NOT Travel (or be heard).

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Sound or Sound Waves, are mechanical energy, and require a mechanical medium to propagate (or travel). That means that the medium must behave or respond in some mechanical way to conduct sound. Air or any liquid or solid will respond mechanically to the compression and refraction of a Sound Wave.

In a vacuum, there is no Mechanical Medium and so Nothing to be compressed, so no sound will travel.
Because sound, unlike light, needs a medium, usually air. In a vacuum, there is no air.
Sounds cannot trasvel in a vacuum because they have no medium in which they can travel through.
Sound travel through matter, trough the interaction of the electrical force between particles.

Vacuum is per definition empty of matter, so there is nothing for a sound wave to propagate trough.
Sound relies on the movement of atoms to propagate.
Sound is simply the vibration of atoms in the air but a vacuum contains no atoms so there are no atoms to vibrate and sound cannot travel.

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