Why do stars twinkle? Because of Earth’s atmosphere!

Hank Green, from SciShow, explains why we see the stars twinkling on the sky. It is because of the moving of the air that the stars’ light flickers and due to the fact that the light comes from a single point light source.

In order words, the light is too dim and too narrow and thus the air movements on Earth make it flicker or twinkle. You won’t see this with the Moon or with planets, because they are not single point light sources, they are bigger. Mystery solved!

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