This is an image of the Moon showing various minerals found on the surface.
Click on image for full size
NASA
About Lunar Water
In the past everyone thought that the Moon had no water. Moon rocks found by Apollo astronauts contained no traces of water. Lunar mapping performed by the Galileo spacecraft, shown here, found no traces of water. The recent
Clementine mission, an Airforce mission, made measurements however, which suggested that small, frozen
pockets of ice may be found in
shadowed regions of the lunar crust. Although the
pockets are thought to be small, the overall amount
of water may be large, perhaps the size of Lake
Erie.
This water may come from comets which hit the Moon from time to time. Water may also come from individual water molecules which migrate to the coldest regions of the Moon where they refreeze on the surface, trapped inside enormous craters at the lunar poles. Some of these deep craters never receive any light from the Sun, they are permanently in the shade.
It is in such craters that instruments on board the Lunar Prospector spacecraft found frozen water. This water-ice could make space operations on the Moon possible, since carrying water from Earth is very expensive.
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