Color Of The Sky

So what's the color of the sky? Is it really blue? If yes, then why does it appear black in night?

The sky appears blue because atmosphere contains gas molecules. John Tyndall in 1859 described that when light passes through any medium holding smaller particles, the blue wavelength is absorbed by gas molecules and then scattered in almost every direction while longer wavelengths simply pass through.

In space, since there is no atmosphere so there is no scattering of light and sky appears black and sun as white.


Written By Dr. Muhammad Wasif Haq, Karachi, Pakistan.


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