Why do stars twinkle?

Different layers of air are found in the Earth's atmosphere. The temperature and density of these layers are different. When the rays of light from the stars cross the earth's atmosphere, due to the difference in temperature and due to the dust particles, they get bent and spread at the edges of the barrier, which we call diffraction. When the rays of light pass through a denser medium When it goes into a rarer medium, it moves away from the normal and when it goes from a rarer medium to a denser medium, it bends towards the normal, due to which the path of its light keeps changing, hence the apparent position of the star keeps getting deviated. And the amount of starlight entering the eyes keeps flickering, due to which the stars appear to twinkle.

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