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天空为什么是蓝色的？

天空之所以呈现蓝色，是因为光在大气中的散射现象。当太阳光穿过大气层时，其中的短波蓝光波长较短，故更容易被分散。而长波红光波长较长，相对不容易散射。因此，当太阳光穿过大气层后，蓝光更多地散射到各个方向，所以我们看到的天空是蓝色的。这种散射现象被称为蔚蓝天空。

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