As refraction takes place in atmospheric layers and both stars and planets are outside the atmosphere so why do stars twinkle and planets do not?

Asked by parmodgulati | 5th Jan, 2014, 05:22: PM

Expert Answer:

Planets are closer to earth compared to stars and so they appear bigger. A planet can be considered to be made up of a no. of point sources of light. Due to atmospheric refraction, when some of the point sources look brighter, others appear dimmer. So, on the whole overall brightness of a planet remains the same always. Hence, planets do not appear to twinkle like stars.

Answered by  | 5th Jan, 2014, 10:40: PM

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