Another way of defining the photosphere of a star is that it is a layer within the atmosphere of the star, where a photon of a given wavelength has a roughly 50% chance of escaping from the star and heading off into interstellar space. Our “lucky” photon still has a long way to go before it can reach a detector here on Earth, including two major obstacles in its way.
Solar Wind Color Index Radiation Pressure Interstellar Medium Mass Loss Rate
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