The energy of the Sun is created inside its enormous heat and pressure, in a fusion reaction (i.e. in great heat and pressure four hydrogen atoms are combined into one helium atom, and thus a large amount of energy is released). This energy is transported by radiation in the inner 70% and by convection in the outer 30% of the Sun. On the surface the convection can be seen as granulation, which resembles bubbles. Moving currents and the rotation of the Sun form a complex magnetic field, whose strength varies and poles change in 11-year cycles.
