Question

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in short, why do stars twinkle while the planets don't?

Answer 1

because of total internal reflection
hope this helps you quickly

Answer 2

Planets, just like the Sun, do not twinkle.Planets are also closer to the Earth than those distant stars, so planetsappear larger in comparison. Due to the planets' apparent closeness to Earth, the light coming from these celestial bodies does not bend much due to Earth's atmosphere.