MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
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.
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