The sunset glow as an avatar means nostalgia. In the morning and evening, colorful clouds often appear on the horizon before and after sunrise and sunset. The formation of morning glow and 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.

these atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light source.