When you analyze this light, you can figure out their distance from theEarth, and identify what they are made of, determine their chemical composition.
当你分析这些光的时候,你可以计算出它们与地球的距离,并确定它们由什么构成,查明它们的化学成分。
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This is why the discovery of water in the interior ofthe moon is really a critical piece ofthe puzzle to try and figure out how the Earth and the moon are really linked.