Sound needs something to travel through to get from one place to another. On the Moon, since there is no air, sound cannot travel above the surface. So, there are no sounds on the surface of the Moon. When the Apollo astronauts were out on the Moon’s surface, they could only talk to each other, and to mission control, by using the radios in their air filled helmets. Even when the astronaut in the photo to the right, hit a metal tube into the ground with a hammer, no sound was made.
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As there is no air on the moon and sound travels through a medium