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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.

The passage mentions the concentration of the salt solution in Monahans 1998 primarily in order to

A.introduce a fact that suggests that water was not incorporated into the parent asteroid of Monahans 1998 as it coalesced
B.present evidence that suggests that more water of primordial origin may soon be detected by astronomers
C.raise the possibility that a significant amount of water may have been present at the solar system's formation
D.cast doubt on the theory that the water contained in Monahans 1998 was carried there by a comet or other water-rich projectile
E.provide a rationale for astronomers' beliefs about conditions in the early solar system under which chondrites formed

C显示答案

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