Physics
Ozone layer in the outer atmosphere helps us in

Absorbing UV radiations
Regulating the temperature of atmosphere
Absorbing cosmic ray particles
Reflecting radio waves and makes radio communication possible

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Physics
Planets do not twinkle because

They emit light of a constant intensity
Their distance from the earth does not change with time
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.

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