奥尔特云
參考資料

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↑  絕對星等所代表的是天體如果置於地球以外某特定距離時所呈現的亮度。與視星等不同的是，絕對星等把所有天體都假設置於同一距離，因此也是對天體亮度的測量。絕對星等越低，亮度就越高。
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