Question

why there is no atmosphere in surface of moon.​

Answer 1

Explanation:

Moon doesn't have any atmosphere because it is too small and doesn't have any magnetic field.

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Answer 2

Answer:

Moon has no atmosphere because the value of acceleration due to gravity ‘g’ on surface of moon is small. Therefore, the value of escape velocity on the surface of the moon is small (only 2-5 km ${{s}^{-1}}$). The molecules of the atmospheric gases on the surface of the moon have thermal velocities greater than the escape velocity. That is why all the molecules of gases have escaped and there is no atmosphere on moon.