What term defines the boundary surface or outermost layer of the Sun from which visible light is directly radiated into space, commonly considered the Sun's 'surface'?
Answer and explanation
Correct answer: A. Photosphere
- Step 1: The Sun is an entirely gaseous plasma sphere without a solid boundary, but its opacity changes rapidly over a thin layer of about 400 kilometers.
- Step 2: This thin boundary layer, where optical depth reaches approximately 2/3 and visible light escapes into space at an effective temperature of 5,778 K, is called the photosphere.
Answer
Photosphere
Why not the others: 'Chromosphere' The chromosphere is a reddish gaseous atmospheric layer located directly above the photosphere; 'Corona' The corona is the extremely hot, tenuous outermost atmosphere extending millions of kilometers into space; 'Radiative Zone' The radiative zone is an internal solar layer between the core and convection zone where energy transfers by photon radiation.
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