Q.

Stars in the sky appear to twinkle due to –

A. a series of refractions
B. a series of reflections
C. a surface tension phenomenon
D. multiple diminishing brightness
Answer» A. a series of refractions
Explanation: The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
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