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Image of the sun

Why the sun looks brighter in the center and a bit darker around its edge in any image? Is there any specific explanation behind this? Thanks.

The image is collected from: http://www.ifa.hawaii.edu/info/press-releases/solar_rotation/

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Hello! It's a very interesting and important question you asked. There is a scientific name for this phenomenon known as "Limb Darkening" . It's actually caused by stellar atmoshphere and the line of sight we're viewing at the moment. There is further mathematical explanation on it in "Introduction to Modern Astrophysics" book if you want to check.

Someday you may find a problem regarding this topic in the Olympiad.
Besk of luck!

https://en.wikipedia.org/wiki/Limb_darkening