Physics
The direction of heat flow between two objects depends on

Their temperatures
Their heat contents
Whether they are in solid, liquid or gaseous state
Their masses

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Physics
Planets do not twinkle because

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
They are nearer to earth and hence we receive a greater amount of light.

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