十万个为什么·科学阅读30篇（4）
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Why Do Mountains Look Bluer the Farther Away They Are?
为什么远处的山看起来更蓝？
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Distant mountains appear bluish due to Rayleigh scattering—the same effect that makes skies blue.
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Sunlight contains all colors, but shorter blue wavelengths scatter more easily off air molecules and tiny particles.
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As light travels farther through the atmosphere, more red and yellow light reaches our eyes directly.
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Meanwhile, scattered blue light fills the space between us and the mountain, acting like a translucent veil.
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This atmospheric haze reduces contrast and softens edges, making peaks look less sharp and more dreamlike.
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On humid or polluted days, the effect intensifies because larger particles scatter even more light.
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Photographers call this ‘aerial perspective’ and use it deliberately to create depth in landscape images.
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Mountains closer to you reflect their true rock-and-vegetation colors, while distant ones blend with sky tone.
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At sunrise or sunset, warm light can overpower this blue cast, revealing orange or purple mountain silhouettes.
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Satellites correct for this scattering effect when mapping Earth’s surface accurately from space.