Light

Solar energy results from nuclear fusion in the sun's core, which creates an enormous, continuous flow of radiant energy that travels throughout the solar system. The energy that reaches us from all the stars twinkling in our galaxy can not compare with what we receive from the sun, the only significant source of energy for Earth's atmosphere.
FAST FACT - Only about 50 percent of the sun's energy arrives at the Earth's surface.
                      Colors of a rainbow
                           By wavelength
                     Red - 650 nanometres
                    Orange - 600 nanometres
                   Yellow - 580 nanometres
                    Green - 550 nanometres
                    Cyan - 500 nanometres
                    Blue - 450 nanometres
                    Violet - 400 nanometres