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thermosphere
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layers of Earth's atmosphere atmosphere: vertical structure
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thermosphere

atmospheric science
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atmosphere

thermosphere, region of increasing temperature in Earth’s atmosphere that is located above the mesosphere. The base of the thermosphere (the mesopause) is at an altitude of about 80 km (50 miles), whereas its top (the thermopause) is at about 450 km.

This article was most recently revised and updated by John P. Rafferty.