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Explain why the planets do not twinkle....

Explain why the planets do not twinkle.

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The planets are much closer to the earth, and are thus seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, the total variation in the amount of light entering our eye from all the individual, point-sized sources will average out to zero, thereby nullifying the twinkling effect.
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With a neat labelled diagram, explain twinkling of a star. Also explain why a planet does not twinkle.

(a) Give reasons for the following: (i) The sky appears to be blue during day time to a person on earth. (ii) The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise. (iii) The sky appears dark instead of blue to an astronaut. (iv) The stars appear to twinkle. (v) The planets do not twinkle.