![EdmundHalleywasanEnglishscientistwholivedover200yearsag...]( "EdmundHalleywasanEnglishscientistwholivedover200yearsag...")
- 问题详情：EdmundHalleywasanEnglishscientistwholivedover200yearsago.Hestudiedthe1111]observationsofcomets(彗星)whichotherscientistshadmade.Theorbit（轨道）ofoneparticularcometwasaverydifficultmathematicalproblem.Hecouldnotfigureitout.Neithercouldotherscient...
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