What is the atmosphere?

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The atmosphere is a gaseous layer that surrounds many celestial bodies including stars, planets and satellites. Among the known planets, Earth is the only one that has an atmosphere with high concentrations of oxygen (21%) and nitrogen (78%), gases that allowed the emergence and development of living beings. Since it surface, the atmosphere consists of the troposphere, which rises between 10 and 18 km in height, the tropopause, the transition zone, the stratosphere, from 20 to 50 km, which is the layer ozone in the mesosphere, from 50 to 80 km, the thermosphere, the ionosphere, up to 400 km and the metasfera, and finally the protosfera, until approximately 1000 km altitude.

Through the ionosphere (also called upper atmosphere), which is ionized, transmitted radio waves and television.

What is the polar aurora?

It is a luminous phenomenon of the atmosphere located between 80 and 300 km in height, visible from the area near the poles but in the circumstances can be seen even in the tropics. It has various forms.

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