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16-Nov-2017 14:33

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.

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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.The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).In general, air pressure and density decrease with altitude in the atmosphere.

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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 three major constituents of air, and therefore of Earth's atmosphere, are nitrogen, oxygen, and argon.