Question

why do stars twinkle

Answer 1

DEAR !!

it is due to rarefaction of Light...it travels in different layers so,Stars seems Twinkling.

Answer 2

$\underline{\underline{\tt \: TWINKLING \: OF \: STARS \: }}}$

Stars actually shine with a more or less constant light. They appear to twinkle those of us observing them from Earth due to mostly to atmospheric interference. Molecules and dust particles float at random in Earth's covering of gases. When such floating particles pass between a star and a person observing it, there is a brief interruption in the stream of light. Added together, these brief interruptions give rise to twinkling stars.