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Without an atmosphere, water or water vapor will be ionized by the intense solar radiation and become hydrogen and oxygen. The hydrogen is swept away by the solar wind. At low pressures, water's boiling point (vapor point) is very low, and in a vacuum it will rapidly disperse.

The water that does exist on the Moon is found as ice deposited by comets and asteroids. The ice is buried deep within craters near the lunar poles, where sunlight never reaches it.

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