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若问夜空为何是黑的?人们自然会说,因为夜晚没有太阳照耀。实际上,问题并非如此简单。人们知道,在无限宇宙中有无数个恒星构成的星
If asked why the sky is black? People will naturally say, because the night is not the sun shines. In fact, the problem is not so simple. People know that there are countless stars in the infinite universe