This drawing shows how individual molecules may move near the surface of the Moon to form an atmosphere.
The Lunar Atmosphere
People used to think that moons such as the Earth's moon had no atmosphere whatsoever. Now, however, measurements have shown that most of these moons are surrounded by a *very* thin region of molecules which can *almost* be called an atmosphere. Such is the case with the Moon.
The atmosphere may come from a couple of places, one place is
outgassing or the release of gases from deep within the Moon's
Another source, as shown in this diagram, are molecules which are loosened from the surface when other molecules from space hit the ground. These molecules may migrate across the surface of the Moon, to colder regions where they re-freeze into the ground. Or they may fly off into space. This is one way lunar water may be formed.
Molecules from space come from the solar wind. Because its surface is
protected by neither an atmosphere nor a magnetosphere, the Moon is constantly
exposed to the solar wind. These molecules get buried in the Moon's surface. Eventually scientists on Earth will understand more about a process, called nuclear fusion, which is another way create energy. Then these molecules buried in the Moon's surface may become an important source of fuel for energy.
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