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The earth would become so cold that life...

The earth would become so cold that life is not possible on it in the absence of the atmosphere. Explain why ?

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The atmosphere of earth behaves as an insulating envelop to infra red radiations, which do not allow the whole heat received by earth during day time to escape from it during night. But if there is no atmosphere, then the whole heat radiated by earth will leave its surface and it becomes too cold.
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