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According to a study, part of the moon’s water may come from Earth

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Some of the water deposits believed to exist on the moon may have come from an unexpected source: our planet’s atmosphere. 

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According to a new study, around a lake’s worth of water that evaporated millions of years ago from Earth’s atmosphere may be spread under the moon’s surface as liquid deposits or locked in permafrost. 

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This Earthly water might cover up to 840 cubic miles (3,500 cubic kilometers) near the moon’s northern regions, roughly equaling the amount of North America’s Lake Huron, the world’s eighth-largest lake.

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The researchers said in a statement that the moon’s crossing of the magnetotail breaks some of the magnetic lines, which triggers a “shower” of water ions rushing back to Earth.  

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Many of these ions, the researchers said, hit the passing moon and get trapped in the lunar permafrost 

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Impacts of asteroids can then drive the water even deeper below the surface, where it forms liquid deposit 

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