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银河系中大约有4000亿颗恒星，它有多大呢？光直径就10万光年
我们的太阳系位于更大的星系，就银河系之中，在晚上光比较暗淡的地方，天空有一个亮亮的就是银河系，这个银河系到底有多大？银河系究竟有多少恒星？
焦维新教授406/654
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