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Sky’s protection: The sky protects the earth from the lethal rays of the sun. If the sky did not exist then the sun’s radiation would have killed off all life on earth. It also acts like a blanket wrapped around the earth, to protect it from the freezing cold of space. The temperature just above the sky is approximately -270C. If this temperature was to reach earth then the planet would freeze over instantly. The sky also protects life on earth by warming the surface through heat retention.
“We made the sky a protective ceiling. And yet they are turning away from Our signs!” [21:32].