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银河系的质量为太阳质量的1.5万亿倍
天文学家一直试图测量银河系的质量,他们一直得出一些不同的数字。但这并不是说他们数学不好。测量像银河系这样巨大的东西的质量是令人困惑的。它需要一些非常巧妙的策略来约束它的质量。
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