Question

A star appears twinkling in the sky because of

Answer 1

Because, light from the stars need to travel a long distance and pass through the different layers of earth's atmosphere .The light gets refracted and tgus the star appears to be twinkling in night sky.

Answer 2

Stars are point size source of light. It is a very distant object. So the light from this point size source enters the earths atmosphere where it experiences deviation and bends due to the unevenly distributed density of gases and particles.
This deviation sometimes decreases the intensity of light and sometimes increases which causes the twinkling of stars.
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