Question

why do stars twinkle.

Answer 1

Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star's image to change slightly in brightness and position, hence "twinkle."


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Answer 2

Stars twinkle due to the atmospheric refraction of light from stars and changing density of the air around the Earth.

Hope that helps......... :-)