Why do stars twinkle in the sky at night?

Correct option is B

The correct answer is B) Due to atmospheric refraction of starlight.

Explanation:

• Stars twinkle due to atmospheric refraction, as light bends through Earth's atmosphere, causing brightness and color changes.

Information booster:

• Refraction: Bending of light through varying air densities.
• Twinkling: Called stellar scintillation, caused by atmospheric turbulence.
• Biggest Star: UY Scuti, a red supergiant, 1,700 times the size of the sun.
• Stars: Composed of hydrogen and helium; classified by temperature, size, and luminosity, using the 

Incorrect options explanation:

• Dispersion of light: Spreading of light into a spectrum, not twinkling.
• Advance light: Not a valid cause.
• Hot air: Twinkling is caused by refraction, not heat.
• Hertzsprung–Russell diagram