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Earth’s atmosphere is made up of a thin layer of air. This layer of air gets thinner and thinner as you move away from Eath's surface until the air becomes so thin that it merges with space. There is no exact place where earth’s atmosphere ends and space begins. The commonly accepted end of earth’s atmosphere falls within the thermosphere at 62 miles (100 kilometers) above the earth’s surface. This commonly accepted boundary is called the Kármán Line.