Question

why do stars twinkle but planets does not??​

Answer 1

the stars emit their own light and planets do not .

the planets are much closer to the earth than the stars so the light rays coming from a planet does not suffer refraction but the stars are very far away so the light rays flickers and suffer refraction from the Earth's atmosphere

thank you!

Answer 2

when the observer observe the the star we can see that they are far distance from the eye of the observer . at one moment the star appear to be very bright and the next moment it become very dim the twinkling of a star is due to the atmospheric refraction of star light
when the light come from stat enter the earth atmosphere it undergoes refraction due to the varying optical densities of AIT at various altitude the continuous change atmosphere refract the light from the star by different amount from one moment to the next the star light reaching our eye increase and decrease continuous due to refraction star appear to twinkle at night
the star appear appear to be small to us star considers as a point source of light but in other side the planet have quite big to us a planet consider to be a collection of a very large number of point source of light
the continuous changing atmospheric is unable to cause variation in the light coming from big sixed planet because of which the planet does not twinkle