The Moon did have an atmosphere at one time. After the collision, massive volcanism was present on the Moon, so, how long did the atmosphere stick around? Was it as massive as Venus'?


Seconldy, the Moon had to have been struck with many comets as Earth. Where did the water go? Could there not be underground reserves of water on the Moon?

Also, have we found any evidence of running water on the Moon? A dry riverbed and such?

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Earth has only a fraction of it's water from comets and Moon was not massive enough to retain much water, simply, it evaporated into space except maybe for some ice on the bottom of craters in enternal shadow.

No dry riverbeds.

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Actually, the Moon does have an atmosphere, as do all bodies with any sort of gravitational pull.

Not much of one, though! It keeps getting ripped by solar winds.

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I'm pretty sure the moons atmosphere is only out 1-2 inches from the surface.

Definitely not, the weaker a body's gravitational field the further its atmosphere extends, so the Moon's atmosphere probably extends further than Earth's (assuming that the effects of the solar wind don't tear it away before that). On the other hand a neutron star's atmosphere does extend only a couple of feet from its surface because of its enormous gravitational field.

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