Star Twinkle because of
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Stars do not really twinkle, they just appear to twinkle when seen from the surface of Earth.
This is because of the atmospheric refraction of starlight . When starlight enters earth’s atmosphere, it is affected by winds in the atmosphere and by areas with different temperatures and densities. So the light gets refracted at different levels and the path of rays of light coming from the star goes on varying slightly.
The apparent position of the star fluctuates and the amount of starlight entering the eye flickers. Thus, the stars seem to twinkle.