Stars with a temperature of 7,200 to 12,600 degrees F emit the major part of their light in the visible spectrum. For each temperature, there is a specific wavelength in which most of the light is emitted. The wavelengths of green light are 500 to 560 nm, meaning that stars with temperatures between 9,400 and 10,475 degrees emit most of the light in the green area. This type of star is very common. The sun belongs to this group, even though we do not perceive it as a green star.

The sun seems white to us because it does not just emit light within one particular wavelength. If most of the light emitted is in the green area, there is also a lot of light emitted in the other colors of the spectrum. When the eye perceives light from so many colors, it sees a mixture of all colors, which it perceives as white.