Question

Only the stars near the horizon twinkle while those overhead do not twinkle why?

Answer 1

Answer:

The other answers here are correct about the depth of atmosphere the light has to penetrate. Generally, however, even the stars directly overhead twinkle, that’s how, when we look up, we can tell the difference between planets and stars. The visible planets normally have a stead light, whilst stars (other solar systems) twinkle. This is because of the extreme distance the photons have traveled and the light has dissipated or degraded since the time the light left the star. Then the atmosphere distorts the light making it degraded even more. Look above you, you will still see twinkle, twinkle little stars.