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Lunar water, i.e., water on the Moon, is a matter of interest in astrophysics. The lunar surface is dry and the atmosphere is meager and theory suggests water vapor should undergo photodissociation by the Sun's ultraviolet light and the hydrogen should escape (atmospheric escape). However, a little water vapor is detected in the atmosphere, there is a good chance of ice in shadowed regions near the poles, and there appears to be some water in the minerals making up the lunar surface. The resulting total amount of water is a matter of current debate and study. It is also of much interest regarding whether there is enough available water to be used for projects on the Moon, including future habitation.