Does really Stars Twinkle at Night ?

                      Every star from our planet earth is almost located at an infinitely very large distance. Since the sun is also a star it is near to the earth, the light which is emitted from it reaches to the earth faster when compared to the other stars in the deep space. Light rays from the sun can directly penetrate from the earth's atmosphere due to the distance when it is compared to other stars.

                       In Night Sky, When the light is propagated from the stars which are at a far distance from the earth, It bends (or) Refracts from the layers of the earth's atmosphere. The bending of light is called from a transparent medium is generally called as Refraction. When the light which reaches from those stars to the human naked eye, It appears to the human naked eye as the Stars are Twinkling at the night Sky.