哈雷彗星
哈雷彗星（正式名称是1P/Halley）是著名个短周期彗星，每隔75-76年就能从地球高头看到，是唯一能用裸眼直接从地球看到个短周期彗星，人一生中可能经历两次渠个来访。其他能以裸眼观察个彗星可能会更壮观搭更美丽，但可能要数千年才会出现一次。
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