What causes the twinkling of stars at night?


The twinkling of stars is caused from light efraction by various layers of the atmosphere with different refractive indices.

  • The twinkling of stars is caused by light refraction by various layers of different refractive indices. When we look at a star from the ground, it doesn’t always twinkle.
  • It still emits light, but our surroundings make it seem as if it is twinkling. With different refractive index, our atmosphere has different layers.
  • When a light hits the earth’s atmosphere from a distance, it begins to refract the light into any layer that reaches. That’s why we see the twinkling of stars.

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