Background to Solar Energy: Surprisingly, solar power is actually a utilization of a form of nuclear energy. Our Sun is a main sequence star which creates thermal energy essential to life on Earth. This thermal energy comes from the nuclear fusion of hydrogen in the Sun's core. When two hydrogen isotopes combine, they release a helium atom, a freed neutron, and a substantial amount of radiant energy or light. While these rays of light may take anywhere from 10,000 to 170,000 years to reach the Sun's surface from its core, once at the surface, they take roughly 8.3 minutes to reach Earth, where they then provide us with light and warmth, as well as energy for your solar panel to capture and utilize.