What causes sunrises and sunsets to display deep red or orange hues?

Answer

The light must travel through significantly more atmosphere, scattering out more blue and green light

When the Sun is near the horizon, the light path through the atmosphere is maximized, leading to extensive scattering of shorter (blue/green) wavelengths, leaving primarily longer wavelengths (red/orange) to reach the observer.

What causes sunrises and sunsets to display deep red or orange hues?
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