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Sound waves do not move in space; they require matter to be passed on. Sound waves that reach space essential peter out, much like surf waves of an ocean when they hit shore. But at least theoretically, if there were strong enough sound waves to begin with, they would bounce or echo off the edge of the atmosphere and move back toward the earth's surface. Think of a cord tied off at one end and held taut by you at the other end. A quick 'wave' given to the cord will travel to the tied end and back to you. In other words sound would probably behave like radio waves but with much less energy, and they would rapidly be absorbed by the atmosphere itself.

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