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The photosphere is a relatively thin region (Only in the hundreds of kilometers thick in our sun) that lies between the convection zone and the chromosphere. "Photosphere" literally means sphere of light; It is the region responsible for a majority of the visible light emitted from a star. It is the densest part of the atmosphere - much more dense than gases found in the chromosphere and corona. Still, the density here (for an average sized star like the sun) is much less than even the density of air on earth. Due to forces of convection, huge plumes of gas are shot out of the photosphere high into the star's atmosphere.
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