Comet Hartley 2 has the same deuterium-to-hydrogen ratio as ocean water, lending support to the idea that Earth's water was delivered by comets. John Matson reports.
哈特利2号彗星拥有和地球海水相同的氘氢比例，有力支持了地球上的水源于彗星(的观点)。来自约翰·马特森的报道。
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