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Most of the sun's radiation comes to us in the yellow-green part of the visible spectrum.
The photons which leave the surface of the sun have a range of energy levels which can be split up by a prism forming the familiar rainbow of colors, blue for high energy photons and red for low energy etc. How is it then that the combination of all these colors is just right so that it produces white? It seems rather a coincidence! (OK, I know the sun is officially classed as yellow, but it looks white to me!). Surely if the energy levels of just one group of those photons varied, the sun would change color?