How is the sunset glow formed?

The formation of sunset glow is due to the scattering of light by air. When sunlight enters the atmosphere, it will scatter when it meets atmospheric molecules and particles suspended in the atmosphere. In the solar spectrum, colors with shorter wavelengths such as purple, blue and cyan are most easily scattered, while colors with longer wavelengths such as red, orange and yellow have stronger light transmission ability. So we see that the clear sky is always blue, while the light above the horizon is only yellow, orange and red with longer wavelengths.

After these rays are scattered by impurities such as air molecules and water vapor, the sky there will be colorful.

The beauty of sunset glow is fascinating and often becomes a metaphor for a better life and brings hope, so it often appears in literary works.