Sun March 04, 2012 By:

If sound does not travel on moon, it means it is a vaccum. but it's not true. Please explain.

Expert Reply
Sun March 04, 2012
The moon does have an atmosphere, but it's extremely thin, and sound does travel in space but you can't hear it.The density is about a billion times less than the Earth's, so in terms of conducting sound waves, it is pretty poor.
Sound is vibrations, doesn't have to be through air. If you had a helmet that conducted vibration, laid down on the surface, and had someone drop a heavy weight, you could hear the impact if the surface was hard enough to transmit it.
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