Question

what is the atmospheric refraction why stars twinkle and planets do not​

Answer 1

Answer:

Stars have their own light whereas planets do not. Hence stars twinkle at night unlike the planets.

Answer 2

Atmospheric refraction

⏩is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height.

Stars twinkle because

they're so far away from Earth that, even through large telescopes, they appear only as pinpoints

Planets shine more steadily

because they're closer to Earth and so appear not as pinpoints, but as tiny disks in our sky.

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