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01-Jun-2017 19:21

It extends from the mesopause (which separates it from the mesosphere) at an altitude of about 80 km (50 mi; 260,000 ft) up to the thermopause at an altitude range of 500–1000 km (310–620 mi; 1,600,000–3,300,000 ft).The height of the thermopause varies considerably due to changes in solar activity.Because the thermopause lies at the lower boundary of the exosphere, it is also referred to as the exobase.The lower part of the thermosphere, from 80 to 550 kilometres (50 to 342 mi) above Earth's surface, contains the ionosphere.Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space.

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Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.

By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.