As you may know, the sky is blue because the
atmosphere scatters light on the blue side
(smaller wavelength) of the visible spectrum
better than light on the red (large wavelength)
end. When the Sun and Moon are near the horizon
they look orange color because of the greater
atmospheric thickness. As you know, clouds and
other particles in the sky (dust, smoke, etc.) can
also make nice sunsets due to increased scattering
of blue light.
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