Explain why the planets do not twinkle.




Stars are very far away from us and appear point sized to us

So, it appears that light is coming from one point source

Due to refraction of light from this point source, stars appear to twinkle


The planets are at a lesser distance from us as compared to the stars.

Since the planets are closer to us, they appear much bigger and the light appears to come from more than one point.

Dimming effect of some of the points of light coming from planet is nullified by brightening effect of light coming from other points.

Hence, planets do not twinkle.


  1. Class 10
  2. Chapter 11 Class 10 - Human Eye and Colourful World (Term 1)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo