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The photosphere is the layer in the sun's atmosphere that is dense enough to emit plenty of light but not so dense that the light can't escape. Below the photosphere, the gas is denser and hotter therefore radiates plenty of light, but that light cannot escape from the sun because it is blocked by the outer layers of gas. so you cannot detect light from these deeper layers.

Sources: Book The Solar System by Seeds/Backman (7th Edition) P.143

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14y ago

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