16.3 The Sun and Its Layers

By: Joseph Black


The Sun's Core is the central region where nuclear reactions consume hydrogen to form helium. These reactions release the energy that ultimately leaves the surface as visible light. These reactions are highly sensitive to temperature and density.

Radiative Zone

The Sun's raditative zone is the section of the solar interior between the innermost core and the outer convective zone. In the radiative zone, energy generated by nuclear fusion in the core moves outward as electromagnetic radiation. The energy is conveyed into photons.


A corona is an aura of plasma that surrounds the sun and other celestial bodies. The sun's corona extends millions on kilometers into space and is most easily seen during a solar eclipse, it can also be observed with a coronagraph.


An aurora is the result of charged particles colliding, creating bright lights in the sky.
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