為什麼在晴朗的白天，我們看到的天空是藍色的，而不是紅色的？ Why is a clear daytime sky blue instead of red?
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因為波長較短的藍光比紅光更容易被大氣中的氣體分子散射 Because shorter wavelength blue light is scattered by gas molecules in the atmosphere much more than red light 這稱為瑞利散射（Rayleigh Scattering），波長較短的藍光在進入大氣層時會被四處散射，使我們看到蔚藍的天空 This is called Rayleigh scattering. Shorter wavelengths like blue light get scattered in all directions by the gas molecules, making the sky look blue to our eyes.