Finding it helped to confirm the origin of the universe in a blazingly hot, singular event billions of years ago. All cold ultimately derives from outer space. The sun keeps our planet habitable. Remove it and within a week the average global surface temperature would drop to 0° F (-18° C). In a year it would plummet to -100° (-73° C). Long after that it would settle down to -400° F (-240°), the temperature at which the heat radiating from the Earth's core would be in equilibrium with heat escaping into space.
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