This illustration, superimposed on an EIT 304 angstrom image of the Sun taken by the Solar and Heliospheric Observatory (SOHO), shows the innermost solar core, site of nuclear fusion, surrounded by the radiative zone, through which the heat and light from the core slowly, over tens of thousands of years are radiated out, to a third layer, the convection zone, about the upper third of the Sun in which the energy is transported by overturning motions, like the bubbling of a pot of boiling water, u