十万个为什么·科学启蒙30篇（4）
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Why the Sky Looks Bluer at High Altitudes
为什么天空在高海拔更蓝
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Sunlight contains all colors, but blue light scatters more easily than red in Earth’s atmosphere.阳光包含所有颜色，但蓝光在地球大气中比红光更容易散射。
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At sea level, thick air scatters blue light multiple times, mixing it with other colors slightly.在海平面，浓密的空气多次散射蓝光，使其略微与其他颜色混合。
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Higher up, there is less atmosphere above you, so scattering happens less frequently.海拔越高，上方大气越稀薄，散射发生得越少。
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That means more pure blue light reaches your eyes without being diluted by scattered white light.这意味着更多纯净的蓝光直接进入你的眼睛，未被散射的白光稀释。
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Also, fewer dust particles and water vapor exist at altitude to diffuse the light further.此外，高海拔处尘埃颗粒和水蒸气更少，进一步减少了光线的扩散。
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Mountaineers often notice the sky appears deeper and richer in blue near mountain peaks.登山者常发现，靠近山顶的天空显得更深、更浓郁的蓝色。
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Polarized sunglasses enhance this effect by reducing glare from scattered light.偏光太阳镜通过减少散射光造成的眩光来增强这一效果。
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This bluer hue confirms that Rayleigh scattering depends strongly on air density.这种更蓝的色调证实了瑞利散射对空气密度高度敏感。
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Airplanes flying at cruising altitude see an even more intense azure sky.飞机在巡航高度飞行时，看到的天空呈现更强烈的天蓝色。
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The change reminds us how much our view depends on the invisible layer surrounding Earth.这种变化提醒我们，视野在多大程度上依赖于包裹地球的这层无形大气。