Question

why do stars twinkle

Answer 1

here is your answer...

Stars twinkle, I mean scintillate, because as light passes down through a volume of air, turbulence in the Earth's atmosphere refracts light differently from moment to moment. From our perspective, the light from a star will appear in one location, then milliseconds later, it'll be distorted to a different spot.

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Answer 2

Hey mate, here is your answer =
Star twinkles because of the atmospheric refraction as the light again and again, bends towards the normal which cause the shining stars.
Hope it helps u dear