what is meant by twinkling of stars
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The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.
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In simple terms, twinkling of stars is caused by the passing of light through different layers. These layers have different densities and temperatures. Due to this, light rays bent (refracted) many times in random direction. As a result stars appear to twinkle.
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