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1立方光年28.9万颗，科学家发现银河系中心恒星数量多得难以想象
银河系最引人注目的还是它的中心。银河系的中心非常地明亮，是整个银河系最明亮的区域。银河系中心为什么会这么亮呢？银河系中心有什么呢？那里有一个大“太阳”吗？
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