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The outer layer called the Thermosphere is the hottest. This layer of gases is impacted by high energy solar radiation. This radiation is absorbed, and the gases, though extraordinarily thin, become very hot. The actual thermal energy contained within a given volume of the atmosphere is very low.

Above the thermosphere is the exosphere. Molecules there have the same thermal properties, but the region is indistinguishable from space. The temperature in the upper thermosphere is sometimes referred to as the exosphere temperature.

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13y ago

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