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
Super conductors are substances that

Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current
Conduct electricity at high temperature
Conduct electricity at low temperature

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