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Why do stars twinkle?...

Why do stars twinkle?

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The refractive index of the earth.s atmospheres keeps varying in different regions. With increasing altitude, it goes on decreasing due to decreasing density of air. Hence, the starlight entering the earth.s atmospere undergoes continuous refraction is bent towards the normal before eaching our eyes. This causes changes in intensity of starlight entering our eyes. Thus, stars appear to be twinkling.
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