The air layer of the earth shows a structure of several layers, and is tehrefore divided schematically into different "stories". The lowest story, the troposphere, reaches about 11km in the temperature regions; all the weather occurs here. The temperature in this layer decreases from (on average) 15°C on the surface by about 6.5°C per kilometer to around -57°C (tropopause). In the stratosphere the temperature rises to -50°C at an height of 28km. Then there is a rapid increase to 0°C at an altitude of 50km because of the absorption of UV radiation by the ozone in the stratosphere. The top border of the stratosphere is where the highest temperature of the startosphere can be found, and is called stratopause. In the mesosphere, located above the stratopause, the temperature sinks again to -100°C in 80km altitude. Above that, the thermosphere begins which reaches to about 500 to 600km, out to space. There the temperature quickly rises above 100, up to 800°C due to the absoption of rontgen and gamma radiation. Above that, the exosphere begins - the interplanetary space. The high temperatures can, however, due to the low air density, not be compared to those on the surface and/or in the troposphere.