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Q: Why do stars twinkle in the sky at night?
  • A. Due to advance light
  • B. Due to atmospheric refraction of starlight
  • C. Due to dispersion of light
  • D. Due to hot air
Correct Answer: Option B - The stars twinkle at the night in sky due to atmospheric refraction of starlight. When a star light enters into the earth atmosphere, it get refracted through multiple mediums. As the layers of atmosphere are not stable and hence many refractions take place at a certain time, and the star may be observed twinkling.
B. The stars twinkle at the night in sky due to atmospheric refraction of starlight. When a star light enters into the earth atmosphere, it get refracted through multiple mediums. As the layers of atmosphere are not stable and hence many refractions take place at a certain time, and the star may be observed twinkling.

Explanations:

The stars twinkle at the night in sky due to atmospheric refraction of starlight. When a star light enters into the earth atmosphere, it get refracted through multiple mediums. As the layers of atmosphere are not stable and hence many refractions take place at a certain time, and the star may be observed twinkling.