Question

why stars appear twinkling but not Sun?​

Answer 1

Answer:

Unlike stars, planets don't twinkle. Stars are so distant that they appear as pinpoints of light in the night sky, even when viewed through a telescope. Because all the light is coming from a single point, its path is highly susceptible to atmospheric interference (i.e. their light is easily diffracted).

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Answer 2

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1. The atmoshpere consists of a number of parallel layers of air of varying densities .
2. The most dense layer is near the surface of earth,and least dense later is the top most layer.
3. When the rays of light coming from this star pass through atmosphere of varying densities they bend towards the normal.
4. Finally when the refracted rays of light reach the eye, the eye tracee straight line path.
5. Due to this functions of refractive index of layers,stars appear twinkiling.