The Sky Is Blue for a Simple Reason
Sunlight passing through air gets scattered, and shorter blue wavelengths scatter more easily than longer red ones. So blue light gets flung around the sky in every direction.Earth's Atmosphere, Blue Skies, and Red Sunsets
Sunsets Turn Red Because Light Takes a Longer Path
When the Sun sits low on the horizon, its light crosses more atmosphere before reaching your eyes. Much of the blue light has already been scattered out, leaving red light to dominate the sunset.Earth's Atmosphere, Blue Skies, and Red Sunsets
