There is no atmosphere on the moon because

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(B) The atmosphere of a planet or moon is retained due to its gravitational pull. For a gas molecule to be retained,its root mean square velocity $(v_

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The escape velocity at its surface is very low

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(B) The atmosphere of a planet or moon is retained due to its gravitational pull. For a gas molecule to be retained,its root mean square velocity $(v_{rms})$ must be significantly less than the escape velocity $(v_e)$ of the celestial body. On the moon,the acceleration due to gravity is very low,which results in a very low escape velocity (approximately $2.38 \ km/s$). The thermal velocity of gas molecules at the moon's surface temperature is higher than this escape velocity. Consequently,gas molecules escape into space,preventing the formation of an atmosphere. Therefore,the correct option is $B$.

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