Question

WHY DOES STARS TWINKLE WHILE PLANETS DO NOT ? (4MARK)

Answer 1

Unlike stars, planets don't twinkle. Stars are so distant that they appear as pinpoints of light in the night sky, even when viewed through a telescope. Because all the light is coming from a single point, its path is highly susceptible to atmospheric interference (i.e. their light is easily diffracted).

The much closer planets appear instead as tiny disks in the sky (a distinction more easily discerned with a telescope than with the naked eye). Their apparent sizes are usually larger than the pockets of air that would distort their light, so the diffractions cancel out and the effects of astronomical scintillation are negligible.

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Answer 2

Stars twinkle because they are so far away from earth that they appear as a point sources even when seen through powerful telescope. 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 ,and thus appear like disk .
So that's why stars twinkle but not planets.
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