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Stars twinkle because the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a star changes with time.

Stars are located so far away from the earth, even when viewing it through a telescope they appears as a single point of light. When you look up at a star, upheaval in the atmosphere refracts the light from coming from it in different directions. This makes the star appear to change brightness and position, which can make it look as if it’s twinkling.

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