Many people are sure that the sun is yellow, but technically it is absolutely white. Our star radiates light of all visible colors from red to violet with the light of green specter being prevalent. All these light waves have different amplitude and frequency and when superimposed on one another create the white light.

Actually, it is quite easy to prove that the sun is not yellow: just look at a white sheet of paper on a clear sunny day and you will see that it is still white. If the star color were yellow than it would give the yellow shade to various objects around us including snow, clouds etc. But why does the sun disk seems yellow to us? Modern scientists still do not have a definite answer. Perhaps this effect results from light refraction by the earthly atmosphere.