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Lunar liquid

Early on, the moon’s interior may have been as wet as Earth’s upper mantle

A new analysis of moon rocks has revealed that the moon isn’t as bone dry as researchers had thought, whetting the appetite of scientists who seek a deeper understanding of how Earth’s natural satellite arose and evolved.

Because the moon is believed to have coalesced from the debris created when a Mars-sized body struck Earth some 4.5 billion years ago, the finding also suggests that Earth acquired a substantial supply of water earlier in its history than some scientists had suspected.

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