Question

Why does the moon have no atmosphere?

Answer 1

because there is no gravity on moon..... and there is no any gas or air on moon and we fell overself weightless

Answer 2

First of all the moon has an atmosphere but it is so thin, atoms and molecules almost never collide. Instead, they are free to follow arcing paths determined by the energy they received from the processes described above and by the gravitational pull of the moon.
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