Why do the stars twinkle ?

"Twinkling" has to do with a turbulent atmosphere. Stars in our sky are usually point-sources of light; when there's air currents moving around the image that we see, that point source can appear to jump, interrupting the flow of light we see - and, it appears to "twinkle."

Planets in the sky - Jupiter, Venus, Mars - appear larger; they're *not* point sources, as we can actually see their disks. Now, when the air is turbulent, the effect is different, because their light comes from many points - and, they do not seem to twinkle, because that light flow we see isn't interrupted.

Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star's image to change slightly in brightness and position.

The stars twinkle because the light from them can come at different levels. Im not even sure, i just really like science :)

But then remember that the nearest star to us is the sun, and takes about 8 minutes to get to us. So for some of the farthest stars, you would see the light of a dead star because of how long it took for the light to get to you.

Earth's atmospheric variations cause refraction to vary. Stars are point sources of Light that get affected easily by these aberrations.

One of my favourite words - perturbation. The atmosphere is turbulent with heat and density and wind - it is perturbed. As a result the light gets refracted.

they dont u idiot.....stop taking drugs

Because god made it so.