NASA discovers the Moon is wet — now scientists want to go back

The Moon was for a long time considered to be bone dry, with analyses of returned lunar samples from the Apollo missions showing only trace amounts of water. These traces were in fact believed to be due to contamination on Earth. But over the past two decades, re-analyses of lunar samples, observations by spacecraft missions, and theoretical modeling have proved this initial assessment to be wrong. “Water” has since been detected inside the minerals in lunar rocks. Water ice has also been discovered to be mixed in with lunar dust grains in cold, permanently shadowed regions near the lunar poles.…

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