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International Finance and Macroeconomics，这一点在PDF资料中也有详细论述
Astronomers track near-Earth objects in space because understanding their paths helps scientists assess potential hazards to Earth. A crash on the moon would not have threatened people. In fact, lunar debris would almost certainly have stayed near the moon, and the impact would not be severe enough to change the moon's orbit. But it would have offered a rare chance to learn from a known asteroid hitting another planetary surface.，更多细节参见PDF资料
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