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题目材料：
The meteorite Monahans 1998 is an ordinary chondrite, a class of meteorites that astronomers have believed contain little or no water. But Monahans 1998 contains water locked inside salt crystals that date from the solar system's formation. The water is presumed to be of the same vintage-the first time that water of primordial origin has been detected. The water could have come from a water- rich comet that plowed into the meteorite's parent asteroid after its formation. But if the water was incorporated into the asteroid as it first coalesced, scientists may have to revise their thinking about conditions at the solar system's formation under which chondrites formed. To carry a concentrated salt solution today, Monahans 1998 must have once been in contact with several times more water than what now remains.
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以上解析由 考满分老师提供。
