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十万个为什么·科学阅读30篇(6)

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What Makes the Sky Blue?

What Makes the Sky Blue?

天空为什么是蓝色的?

  1. Sunlight looks white but contains all colors.
  2. Air has tiny molecules and dust particles.
  3. Blue light waves are short and scatter easily.
  4. They bounce off air particles in all directions.
  5. Red light waves are longer and pass straighter.
  6. Our eyes catch more blue light from the sky.
  7. At sunrise or sunset, light travels farther.
  8. Then red and orange light scatter more instead.
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