Description
在北半球夏季的夜空中，如果观测条件非常好，通过肉眼很容易就能看到一条白色的光带横跨整个天空，这就是银河系的盘面。人马座方向的银河看起来最厚最明亮，因为那是银河系中心的方向，恒星分布比较密集。那么，银河系的结构究竟是怎样的呢？
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