Question

why does moon have no atmosphere ​

Answer 1

Here in the dense atmosphere at the surface of Earth, the molecules' motion is dominated by collisions between the molecules. However themoon's atmosphere is so thin, atoms and molecules almost never collide.

Answer 2

Answer:All gases escape since there is very low gravity.

Explanation:Moon has very low gravity and so have low escape velocity.The atmospheric gases on the surface of the moon have thermal velocities greater than escape velocity and so molecules of gases escape . Hence there is no atmosphere on the moon.