银河系
银河星系（古称银河、天河、星河、天汉、银汉等），是包含太阳系个一个星系。从地球看，因为是从盘状结构个内部向外观看，因此呈现勒天球上环绕一圈个带状。伽利略勒1610年使用望远镜首先解析出环带是由一颗颗恒星聚集而成。
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