Why does stars twinkle ?
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Stars appear to twinkle because of atmospheric refraction, or the bending of starlight as it passes through Earth’s atmosphere. The atmosphere has different layers with varying temperatures and densities, which cause the light to refract at different levels. This causes the light’s path to change slightly, which makes the star’s apparent position fluctuate and the amount of starlight entering the eye flicker. As a result, the star may appear brighter or fainter at different times, which is what makes it seem like it’s twinkling.