The formation of lunar rilles remains a mystery.

月球山谷的形成仍是一个谜。

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The researchers determined that the lunar water likely originated early in the moon's formation history, suggesting that it is, in fact, native to the moon.

研究员表示，月球水很可能是在月球形成早期产生的，也就是说，是月球“天生”就有的。

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Many areas of the lunar South Pole are literally frozen in time, holding preserved clues to the formation of our solar system.

月球南极的很多地区都保留着古老的地理线索，对研究太阳系的形成很有帮助。

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If the moon harbours ice, for example, measuring the amount of it at different depths could enable planetary scientists to work out the rate at which comets smashed into the lunar surface over its history, and that knowledge could then be plugged into models of the formation of the solar system.

ECONOMIST: Divining water