十万个为什么·科学阅读30篇（4）

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为什么远处的山看起来更蓝？

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