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limb darkening

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limb darkening: see sun sun, intensely hot, self-luminous body of gases at the center of the solar system. Its gravitational attraction maintains the planets, comets, and other bodies of the solar system in their orbits.
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limb darkening

In astrophysics, the gradual decrease in observed brightness of the disk of a star from its centre to its edge (limb). This phenomenon, readily apparent in photographs of the Sun, occurs because the solar atmosphere's temperature increases with depth. Looking at the Sun's centre, an observer sees the deepest, hottest layers, which emit the most light. At the limb, only the upper, cooler layers, which produce less light, are visible. Observations of solar limb darkening are used to determine the temperature structure of the Sun's atmosphere.


limb darkening [′lim ‚där·kə·niŋ]
(astrophysics)
An observed darkening near the surface of the sun's limb as compared to its brighter center.


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The limb darkening and spherical shape of Ceres shown in the stacked colour image is clearly evident when compared to the seeing disk of the star, Denebola (Beta Leonis) recorded at the same time under similar conditions.
 
 
 
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