[[1]] refraction is the phenomenon which causes the twinkling of stars.

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Detailed Solution

Atmospheric refraction is the phenomenon which causes the twinkling of stars.
The twinkling of stars is due to the continuously changing intensity of starlight that reaches the atmosphere. When the light from a distant star reaches the atmosphere, it undergoes refraction due to varying optical densities of the earth's atmosphere. Hence, the reason behind the twinkling of stars is the atmospheric refraction of light.

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