Question

Why do stars twinkle,what's the phenomenon, what happens?

Answer 1

in the stars there is reaction of hydrogen and helium which produces a lot of light energy so it twinklea

Answer 2

Stars twinkle, I mean scintillate, because as light passes down through a volume of air, turbulence in the Earth's atmosphere refracts light differently from moment to moment. From our perspective, the light from a star will appear in one location, then milliseconds later, it'll be distorted to a different spot.