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为什么天空是蓝色的?

天空之所以呈现出蓝色，是因为大气中的气体和粉尘对太阳光的散射现象。当太阳光照射到大气层时，其中的蓝光波长比较短，因此容易被空气中的分子所散射。而其他波长较长的光，如红光和橙光，更容易通过大气层而到达地面。所以我们在抬头看天空时，看到的是被散射出来的蓝光，因此天空呈现出蓝色的颜色。

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