What Causes Limb Darkening

question 190

Multiple Choice

What causes limb darkening?

• A) The photosphere at the edge of the Sun's surface is cooler than it is in the middle of the Sun's surface.
• B) The limb of the Sun is darker than the center because sunspots collect along the limb.
• C) Light reaching Earth from the limb of the Sun originates in the higher, cooler layers of the Sun.
• D) Convection within the Sun is more efficient laterally than it is vertically with the result that the middle latitude regions of the Sun's surface are hotter than the poles.

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