Question 9:
Why do stars twinkle?
Answer:
Stars emit their own light and they twinkle due to the atmospheric refraction of
light. Stars are very far away from the earth. Hence, they are considered as point
sources of light. When the light coming from stars enters the earth’s atmosphere,
it gets refracted at different levels because of the variation in the air density at
different levels of the atmosphere. When the star light refracted by the atmosphere
comes more towards us, it appears brighter than when it comes less towards us.
Therefore, it appears as if the stars are twinkling at night.
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