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EdmundHalleywasanEnglishscientistwholivedover200yearsag...
问题详情:EdmundHalleywasanEnglishscientistwholivedover200yearsago.Hestudiedthe1111]observationsofcomets(彗星)whichotherscientistshadmade.Theorbit(轨道)ofoneparticularcometwasaverydifficultmathematicalpro...