Question

n 1)why star twinklings at night?

Answer 1

beacuse the light from the stars travels through the different layers of our atmosphere having different refractive indexes.So at one moment they are bright, and at one they are dim. This results in twinkling of stars.


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Answer 2

   here is your answer

because of the effects of the atmosphere.when starlight enters our atmosphere it is affected by winds in the atmosphere and by areas with different temperature and densities..