Occupying its outermost third is a convective zone where gas is rising and falling in planet-sized cells.

BBC: Sun, Trace

Below the convective zone lies a radiative zone, which is a calmer region, where photons transport the Sun's energy outward.

BBC: Sun, Trace

Last year, scientists using a technique called helioseismology, probed the Sun's interior, revealing that currents of gas at the base of the convective zone change velocity every 16 months.

BBC: Sun, Trace