The escape velocity of the moon is less than the average velocity of the atom or molecule of gases. Hence all gas molecules escape out of moon's gravitational field .
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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