Question

The star twinkle in the night because?

Answer 1

Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star's image to change slightly in brightness and position, hence "twinkle.
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Answer 2

$\huge{Answer}$
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$\underline\bold{Reason}$

The stars twinkle due to the atmospheric refraction of light.

The atmosphere refraction means the bending of light rays caused by the earth atmosphere

So, here the amount of starlight reaching our eyes and decreasing causes the star to appear twinkling..

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