Twinkling of stars is on account of :

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Large distance of stars and storms in air

Small size of stars

Large size of stars

Large distance of stars and fluctuations in density of the air

answer is D.

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Detailed Solution

Concept: The atmosphere's refraction of starlight is what causes the stars to twinkle. Atmospheric refraction is the term used to describe light refraction caused by air layers with different optical densities in the Earth's atmosphere.
Because of the physical properties of the atmosphere, the density of the air at various levels of the atmosphere changes constantly.
As a result, the refractive index of the atmosphere's various layers is constantly changing. Because starlight is subject to many refractions and changes in how much of it reaches the eye, it appears that stars are twinkling as a result of this fluctuation in perceived brightness.
Hence, the correct option is 4.

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