Noun
A sphere of light; esp., the luminous envelope of the sun.
Source: Webster's dictionaryAbove the photosphere visible sunlight is free to propagate into space, and its energy escapes the Sun entirely. Source: Internet
As a result, an orderly motion of the mass develops into thermal cells that carry the majority of the heat outward to the Sun's photosphere above. Source: Internet
Assuming these circumstances can be realized, the outer layer of the star is somewhat analogous to the example of an enclosure with a small hole in it, with the hole replaced by the limited transmission into space at the outside of the photosphere. Source: Internet
Diameter seeAlso On 13 December 1920, Betelgeuse became the first star outside the Solar System to have the angular size of its photosphere measured. Source: Internet
Because the Earth's surface is colder than the photosphere of the Sun, it radiates at wavelengths that are much longer than the wavelengths that were absorbed. Source: Internet
During partial eclipses most sunlight is blocked by the Moon passing in front of the Sun, but the uncovered parts of the photosphere have the same surface brightness as during a normal day. Source: Internet