•Sources and chemical forms of water on the Moon Water on the Moon is found on its surface. Liquid water cannot remain on the Moon’s surface and water vapor is quickly lost into space by being separated by sunlight. There are two potential sources of water on the Moon: water-bearing comets and other objects that impact the Moon, and in situ production. The latter is theorized to be produced in small amounts by the chemical combination of hydrogen ions (protons) in the solar wind with oxygen atoms in the Moon’s minerals (oxides, silicates, etc.), forming water or hydroxyl groups, the possible precursors of water.
Uncertain evidence of the presence of liquid water on the Moon has been obtained in various models that assume the presence of bound hydrogen. Moon scientists have debated the possibility of water deposits for decades. Now, they write in a report that they are “confident that the decades-long debate is over.” “There is water on the Moon everywhere, not just in minerals, but in fragmented form on the surface and probably in the form of ice blocks or slabs deep down.”
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