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Water Ice At The Lunar Poles

After seven weeks in lunar orbit, instruments on NASA's Lunar Prospector spacecraft found strong evidence for water ice on the Moon. This ice is likely in the form of crystals, mixed in low concentrations with material in craters around the frigid North and South lunar poles. Estimates suggest there could be 10 to 300 million metric tons of water ice, likely a result of meteoritic and cometary bombardment.