Glossary term: 哈雷彗星
Description: 哈雷彗星可以说是最著名的彗星，因为它是唯一一个肉眼可见的短周期彗星，且周期足够短（约75年），使人们在一生中有机会见到它两次。哈雷彗星上一次造访是在1986年，预计将于2061年再次回归。它以英国天文学家埃德蒙·哈雷的名字命名，他是第一个计算出该彗星周期并预测其下次回归的科学家。哈雷注意到1531年、1607年和1682年出现的彗星轨道非常相似，推断这些彗星其实是同一颗彗星多次造访内太阳系。他成功预测了该彗星在1758年的回归。
哈雷彗星曾被“织女星号”和“乔托号”探测器探访。这些任务发现，彗星的尘埃主要由硅酸盐、铁和镁组成，此外还含有碳氢氧氮化合物（CHON）。彗星的核心主要由冰构成。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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