Scientists pin down the origins of the moon's tenuous atmosphere

While the moon lacks any breathable air, it does host a barely-there atmosphere. Since the 1980s, astronomers have observed a very thin layer of atoms bouncing over the moon's surface. This delicate atmosphere--technically known as an "exosphere"--is likely a product of some kind of space weathering. But exactly what those processes might be has been difficult to pin down with any certainty.