February 1, 2012

General Info Part 3

Why is the moon a silent world?

You can hear sounds under water. In fact, sound travels faster through water than through air. Sound can also travel through metal, such as steel. But no sound can travel across the airless surface of the moon. The astronauts who explored the moon talked to one another by radio. There were no other sounds, not even when they hit a rock with a hammer. It is impossible for sound to travel through the vacuum of outer space.

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