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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.
The atoms and molecules are so far apart that they can travel hundreds of kilometers without colliding with one another.In general, air pressure and density decrease with altitude in the atmosphere.However, temperature has a more complicated profile with altitude, and may remain relatively constant or even increase with altitude in some regions (see the temperature section, below).The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space.The Kármán line, at 100 km (62 mi), or 1.57% of Earth's radius, is often used as the border between the atmosphere and outer space.Because the general pattern of the temperature/altitude profile is constant and measurable by means of instrumented balloon soundings, the temperature behavior provides a useful metric to distinguish atmospheric layers.
In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers.Atmospheric effects become noticeable during atmospheric reentry of spacecraft at an altitude of around 120 km (75 mi).Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.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 exosphere contains most of the satellites orbiting Earth.