The nearest star to the Earth is our very own Sun. It is 152 million kilometers away. The next closest stars are Proxima Centauri and Barnards Star.
As the light from the star passes through the Earth's atmosphere, it is bent by changes in the air temperature, this makes a flickering appearance. Commonly we termed it as twinkle. But fact is most of the stars burn steadily, and if we look at them from space, there is no flickering or twinkling.
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