Physics · Atmospheric Refraction
Stars appear to twinkle in the night sky primarily because:
- 1of the continuous motion of the Earth
- 2the distance of stars from the Earth changes continuously with time
- 3the refractive index of different layers of the Earth's atmosphere changes continuously✓
- 4the intensity of light emitted by the stars varies periodically
Correct answer
the refractive index of different layers of the Earth's atmosphere changes continuously
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