Question

why do stars twinkle

Answer 1

stars twinkle because of turbulence in the atmosphere of Earth.As the atmosphere churns the light from the star is refracted in different directions. This cause the stars image to change slightly in brightness and position hence stars twinkle.

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Answer 2

The twinkling of star is due to atmospheric refraction of starlight. The starlight on entering the earth's atmosphere undergoes refraction continuously before it reaches the earth.The atmospheric refraction occurs in a medium of gradually changing refractive index.The atmosphere bends the starlight towards the normal, the Apparent position of the star is slightly different from its actual position. The star appears slightly higher (above) than its actual position when viewed near the Horizon.since the stars are very distant the approximate point-sized sources of light