Explain why the planets do not twinkle but stars do?
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planets are much bigger in size as compared to stars
planets are a locus of points
therefore the change in the position of planets due to atmospheric refraction is not seen
hence they don't twinkle
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Explanation:
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 sources. Although light coming from individual point-sized sources flickers but the total amount of light entering our eye from all the individual point-sized sources average out to be constant. Thereby, planets appear equally bright and there is no twinkling of planets.
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