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The exosphere is the outermost layer of Earth's atmosphere (i.e. It extends from the exobase, which is located at the top of the thermosphere at an altitude of about 700 km above sea level, to about 10,000 km (6,200 mi; 33,000,000 ft) where it merges into the solar wind.
This layer is mainly composed of extremely low densities of hydrogen, helium and several heavier molecules including nitrogen, oxygen and carbon dioxide closer to the exobase.
These free-moving particles follow ballistic trajectories and may migrate in and out of the magnetosphere or the solar wind.
The exosphere is located too far above Earth for any meteorological phenomena to be possible.
The exosphere contains most of the satellites orbiting Earth.
In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers.
Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere.
Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.
In general, air pressure and density decrease with altitude in the atmosphere.