Why do stars twinkle?



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The change in intensity of light coming from the stars is called twinkling of stars.


The twinkling of stars occurs due to atmospheric refraction of star's light.

The Optical Density of Air continuously changes from one moment to another

When atmosphere refracts more starlight towards us, stars appear to be bright

When they reflect less light, star appear to be dim

Hence, the star light reaching our eyes change continuously and stars appear to twinkle.

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

About the Author

CA Maninder Singh's photo - Founder at Teachoo
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