十万个为什么·科学阅读30篇（3）
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Why Is the Sky Blue?
天空为什么是蓝色的？
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Sunlight looks white but has many colors.阳光看起来是白色的，但实际上包含多种颜色。
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Air has tiny molecules and dust particles.空气中含有微小的分子和尘埃颗粒。
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Blue light bounces off them more than red light.蓝光比红光更容易被它们弹开。
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This bouncing is called scattering.这种弹开现象称为散射。
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Blue light scatters in all directions.蓝光向各个方向散射。
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So our eyes see blue everywhere in the sky.因此我们的眼睛看到天空处处是蓝色。
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At sunset, light travels farther through air.日落时，光线穿过空气的距离更长。
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Most blue light is scattered away, leaving red and orange.大部分蓝光被散射掉了，只留下红光和橙光。