Question

Why stars twinkle Why??
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Answer 1

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Stars twinkle because … they're so far away from Earth that, even through large telescopes, they appear only as pinpoints. ... As a star's light pierces our atmosphere, each single stream of starlight is refracted – caused to change direction, slightly – by the various temperature and density layers in Earth's atmosphere

Answer 2

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Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from thestar is refracted in different directions. This causes the star's image to change slightly in brightness and position, hence "twinkle."