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The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space.
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The exosphere is located too far above Earth for any meteorological phenomena to be possible.
However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.
Layers drawn to scale, objects within the layers are not to scale.
Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.
The exosphere contains most of the satellites orbiting Earth.
The thermosphere is the second-highest layer of Earth's 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.
The atmosphere has a mass of about 5.15 three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.
Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space.
These free-moving particles follow ballistic trajectories and may migrate in and out of the magnetosphere or the solar wind.
The concentration of water vapor (a greenhouse gas) varies significantly from around 10 ppm by volume in the coldest portions of the atmosphere to as much as 5% by volume in hot, humid air masses, and concentrations of other atmospheric gases are typically quoted in terms of dry air (without water vapor).