Answer:
Twinkling of stars. The light from stars undergoes refraction continuously before it reaches earth. So the apparent position of the star is slightly different than its actual position. Due to variation in atmospheric conditions, like change in temperature, density etc., this apparent position keeps on changing. The amount of light entering our eyes from a particular star increases and decreases randomly with time. Sometimes, the star appears brighter and other times, it appears fainter. This gives rise to the twinkling effect of stars. The planets do not show twinkling effect. As the planets are much closer to the earth, the amount of light received from them is much greater and the fluctuations caused in the amount of light due to atmospheric refraction are negligible as compared to the amount of light received from them.
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