Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

In summer, the polar front jet achieves its maximum force.
It is narrow band of high-velocity wind.
Jet streams are typically continuous over long distances.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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