Question

Why planets do not twinkle?

Answer 1

The continuously changing atmosphere is unable to cause variations in the light coming from a big size planet due to reflection because of waste the planet does not Twinkle at all.

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Answer 2

Stars twinkle because they are so far away from Earth that they appear as point sources even when seen through powerful telescopes. The light rays coming from them are refracted multiple times, making them look as if they were blinking. The sun and other planets, however, are quite close to us (relative to stars), and thus appear like disks.