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Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.

Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere.Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres.However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.The exosphere contains most of the satellites orbiting Earth.

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