02. Since space is referred to as a vacuum, can people hear you speak in space, or is it true that people cannot even hear you scream in space? (A K2S Question)

From The Space Library

You are right, space is a vacuum and therefore no sound occurs in the vacuum of space because sound waves require a medium such as water or air through which to travel. There is no atmosphere in space. Screaming will not help. You will need to talk via radio.

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Answer provided by Lonnie Moffitt & Cdr. USN Robert L. Curbeam

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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