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Diagram showing the interior of the Sun. The solar interior is composed of a core (central 30%) a radiative zone outside this, and finally a convective layer occupying the outermost 30% or so. Solar astronomers, using a branch of astronomy called helioseismology, have established that the Sun vibrates in several different modes, somewhat like the skin of a drum, as indicated in this image by the colours on the surface. The blue regions indicate where the surface is moving outwards, while the red ones show where the movement is downwards
