why do star Twinkle
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stars twinkle because of their brightness because of 4 hydrogen atoms will turn into 1 helium atom
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stars emit their own light and they twinkle due to the atmospheric refraction of light. stars are very far away from the earth hence they are considered as a point source of light the refractive index of air changes from time to time due to change of density of air due to Change of the density of earth atmosphere the path of rays of stars continuously change the apparent position of the star continuously change due to change in refractive index of the atmosphere thus the stars appears to twinkle
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