why astronauts use radio in space?
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because radio signals do not need a medium to trave.As there is no air in space thus astronaut s use radio signals.
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Sound cannot travel through the vacuum ofspace, but visible light and other forms of electromagnetic radiation can. ... The astronautshave devices in their helmets which transfer the sound waves from their voices into radiowaves and transmit it to the ground (or otherastronauts inspace
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