alleryPlanets do not twinkle as much as stars because:
APlanets emit their own light
BPlanets appear as extended sources whose fluctuations average out
CPlanets are closer than the atmosphere (option)
DPlanets do not move
Answer & Solution
Correct answer: B. Planets appear as extended sources whose fluctuations average out
1. Planets, being closer, are extended sources rather than point-sized.
2. Atmospheric refraction creates fluctuations from each point on the planet.
3. Sum of many random fluctuations averages out and the planet shines steadily.
_Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.5_
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