When you look up clear night sky,you can see many twinkling stars.
these stars don't really twinkle; thy just seem to.
there is a thick blanket of air around the earth.the light coming from the stars must
pass through this air.
As the star light passes through,it shifts or moves about.
this happens because of moisture in the air, changing air.
the shifting starlight looks to us like twinkling stars.
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