What is the source or cause of the Sun���s light?
Much like other stars the Sun is powered by nuclear reactions. The process of nuclear fusion takes place in the Sun���s core. The intense pressure and temperature at the core causes nuclear fusion - in this case hydrogen atoms fusing to create helium this process releases energy. The energy is emitted as gamma rays which travel slowly from the Sun���s core to the outer region. During the rise to the surface gamma rays collide with electrons degrading in temperature and energy to finally emerge as visible radiation - this is the light Sun produces.