In view of the above (except temperature), the sun is composed of seven colors. The morning sun is red because it passes through the thick atmosphere when it is oblique in the morning. In the seven-color spectrum of sunlight, red light has the strongest penetrating power, while other light has weak penetrating power and is absorbed, so the sun looks red.
The peak wavelength of solar radiation (500 nm) is located between the transition region of blue light and green light in the spectrum. The temperature of a star is closely related to the main wavelength of its radiation. As far as the sun is concerned, its surface temperature is about 5800K K, but because human eyes are more sensitive to other colors near the peak wavelength, the sun appears yellow or red.
Extended data
Spotted tissue on the photosphere of the sun that is brighter than the surrounding area. When observing with an astronomical telescope, it is often found that the surface of the photosphere is bright and dark. This bright and dark spot is formed because of the different temperatures here. The darker points are called "sunspots" and the brighter points are called "sunspots".
Sunspots often "perform" on the edge of the sun's surface and rarely appear in the central area of the sun's surface. Because the radiation in the central area of the sun's surface belongs to the deep gas layer of the photosphere, and the light at the edge mainly comes from the higher part of the photosphere, the light spot is higher than the sun's surface and can be regarded as a "plateau" on the photosphere.
Baidu Encyclopedia-Sun (the central celestial body of the solar system)