The deepest portion of the Sun that we may directly witness is the photosphere. It extends roughly 250 miles (400 km) above the solar disk's visible surface at its core.
The distances from the inner layers, which are measured in terms of distance from the sun's core, and the outer layers, which are measured in terms of distance from the sun's surface, are shown on this diagram as approximations for each layer. The Core, Radiative Zone, and Convection Zone are the inner layers. The Photosphere, Chromosphere, Transition Region, and Corona make up the outer layers.
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