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The scientific name for the twinkling of stars is stellar scintillation (or astronomical scintillation). Stars twinkle when we see them from the Earth's surface because we are viewing them through thick layers of turbulent (moving) air in the Earth's atmosphere.
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Stars twinkle due to the refraction of light.In between the earth and the ★ there are many layers of air therefore the by the time the light of the stars reaches the earth the light refracts and due to successive refractions,stars twinkle.
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