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Why Is the Sky Blue?
为什么天空是蓝色的？
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Sunlight looks white, but it contains 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 has short waves and scatters easily.蓝光波长短，容易散射。
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These small particles send blue light in all directions.这些微小颗粒将蓝光向四面八方散射。
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Other colors like red pass through more smoothly.其他颜色（如红色）则更顺畅地穿透空气。
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So blue light fills the sky around us.因此蓝光弥漫在我们周围的天空中。
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At sunrise or sunset, light travels farther through air.日出或日落时，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，剩下红光和橙光。