Why stars twinkle in the night sky?

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THE  song goes “Twinkle twinkle little star…” Ever wonder what is the cause of the twinkling of stars?

Stars twinkle because we view them through our atmosphere. Seen from the moon, where there is no atmosphere, stars do not twinkle at all, but here on Earth starlight passes through many miles of air on its way to our eyes. A ray of starlight bends slightly each time it enters warmer or cooler air,