Physics
Planets do not twinkle because

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

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor but can be of any shape

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