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彗星拥有狭长的椭圆形轨道，是什么造就了它如此独特的运行方式？首先科普一下，彗星的运行轨道并不都是拉长的椭圆形，除了椭圆形以外，彗星还有双曲线和抛物线这两种轨道形式。太阳系现有的彗星一般都来自 ...
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