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Explain why the planets do not twinkle?...

Explain why the planets do not twinkle?

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Planets are much closer to the earth and are seen as extended sources. So, a planet may be considered as a collection of a large number of point-sized light source3s . Although light coming from individual point -sezed sources flickers but the total amount of light entering our eye from all the individual point-sized sources avereage out the to be constant. Thereby planets appear equally bright and there is no twinkling of plantes.
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With a neat labelled diagram, explain twinkling of a star. Also explain why a planet does not twinkle.

(a) Why do stars twinkle ? (b) Why do the planets not twinkle ?

Knowledge Check

  • Assertion (A): The stars twinkle in night but the planets do not twinkle. Reason (R) :The stars are much bigger in size than the planets.

    A
    Both (A) and (R) are true and (R) is correct explanation of the assertion.
    B
    Both (A) and (R) are true but (R) is not the correct explaration of the assertion.
    C
    (4) is true but (R) is false.
    D
    (A) is false but (R) is true.

  • Planets do not twinkle because :

    A
    Planets are not a source of light .
    B
    The shift in their position (as compared to stars ) is smaller.
    C
    they reflect high intensity light reaching them .
    D
    both (a) and (b) are true .

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