Thu December 29, 2011 By: Niyati Mehta

why do stars appear to twinkle??

Expert Reply
Thu December 29, 2011
Stars do not really twinkle, they just appear to twinkle when seen from the surface of Earth. The stars twinkle in the night sky because of the effects of our atmosphere. When starlight enters our atmosphere it is affected by winds in the atmosphere and by areas with different temperatures and densities. This causes the light from the star to twinkle when seen from the ground due to atmospheric refraction.
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