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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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βˆ™ 12y ago
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βˆ™ 6mo ago

The moon's lack of atmosphere and intense temperatures cause water to evaporate quickly. Additionally, the moon's weak gravity cannot hold onto water molecules for long periods of time, leading to very little water being present on its surface.

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Q: Why does the moon have very little water?
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