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Thermosphere
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Diagram of Earth's atmosphere layers-troposphere, stratosphere, mesosphere, and thermosphere-showing how temperature and air pressure change with increasing altitude, with key features like the ozone layer and pressure percentages at various heights. Diagram showing the layers of Earth's atmosphere from the surface upward: troposphere, stratosphere, mesosphere, thermosphere, and exosphere, with labeled altitudes, weather balloons, airplanes, clouds, auroras, meteors, and satellites for scale.
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Atmosphere
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Thermosphere

atmospheric science
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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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.