The photoshpere is the light emiting layer of the sun that we actually see. It is measueured to be around 6125ºC at it’s base to 4125ºC on top
Above that is the Corona which is a much less dense region of gas above the photosphere, and usually only visible during an eclipse. It is measured to be up to 2,000,000 ºC.
WHY the corona is so much hotter is still a mystery and something we are working on figureing out.
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