If the moon had an atmosphere what would happen to it?

To us? Nothing. Except we might be more likely to colonize it.

The moon does have an atmosphere but it is very thin, it only has one part unlike earth's atmosphere. The atmosphere of the moon is called the Exosphere. Nothing bad will affect it just more craters...

In fact, the moon does not have an atmosphere. The vacuum of space extends all the way to the surface of the moon. If the moon did have an atmosphere, missions like the Apollo program would not have...

If the moon had an atmosphere, it would have weather just like we do. The footsteps on the moon, which are still there now, would be long gone. Other than that, it wouldn't affect Earth very much/at...

There would be no life on earth.