by 
Linda Joy
ANSWERS: 1
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No sound. Sound is a physical wave (much like an ocean wave), and it (therefore) requires a physical medium to "carry it" - that is: a physical medium is what allows a physical wave to move, to have the properties of a wave. *** In space, there is practically no physical matter and - thus - no physical medium and - thus - no sound. *** If you were an astronaut in a spacesuit on an untethered "space walk" and the radio were turned off, the only sounds you would hear would be the sounds that you and your space suit make. The air in your suit, and the suit itself, both act as a "physical medium", and sound can travel through either of those mediums. *** To say all of that another way: the "vacuum" of space acts as an effective barrier to sound. Sound cannot and will not travel through it.
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