Explain why the planets do not twinkle?

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 frmn all the individual point-sized sources average out to be constant. Thereby. planets appear equally bright and there is no twinkling of planets