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.
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Air has tiny molecules and dust particles.
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Blue light bounces off them more than red light.
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This bouncing is called scattering.
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Blue light scatters in all directions.
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So our eyes see blue everywhere in the sky.
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At sunset, light travels farther through air.
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Most blue light is scattered away, leaving red and orange.