Question

how do astronauts talk to each other in space

Answer 1

The astronauts have devices in their helmets which transfer the sound waves from their voices into radio waves and transmit it to the ground (or other astronauts inspace). This is exactly the same as how your radio at home works.

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Answer 2

the astronaut have a device in their helmet which transfer the sound wavs from their voice into radio waves and transmit to the ground . this is exactly same as how radio at home..