Question

why do we see stars twinkling

Answer 1

 When light travels from one medium to another , it undergoes refraction,due to which its path changes. In our atmosphere there are various layers of air which are having different densities, due to which their refractive indices are also different . When a ray of light enters the atmosphere , it undergoes multiple refractions, due to which apparent position of star keeps on changing ,intensity of light coming from stars also fluctuate with time and stars appears to be twinkling.

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Answer 2

Light from  stars crosses a very long distance to reach us.

it passes through pockets of Earth’s atmosphere which vary in temperature and density.

Our atmosphere is very turbulent, with streams and eddies forming, churning around, and dispersing all the time.

Every layer of Earth’s atmosphere has air moving in different directions at different intensities.

When light from stars passes through the atmosphere, it is bent due to refraction.

which is why stars seem to twinkle when we stare at them.

If viewed from outer space, you would not see the stars twinkling.

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