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Sound needs to travel in medium like air, but there is no air in outer space, so sound is unable to travel.

So basically sound needs air to travel, if there is no air sound cannot travel, when sound is unable to travel you cannot communicate (talk, speak, etc)

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Q: Why did astronauts who did experminets on the moon communicate with each other using walkie talkies even when they were right next to one another?
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