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The mesosphere is the coldest layer. In the outer mesosphere, temperatures approach -90 degrees Celsius.

However, a thermometer would measure the thermosphere to be well below 0 degrees Celsius. The thermosphere is actually very hot. It can get up to 1, 800 degrees Celsius. You would not feel that warmth though because temperature is the average amount of energy in motion of each molecule of a substance. The gas molecules in the thermosphere move very rapidly, so the temperature is very high. The molecules are spread very far apart and there are not enough of them to collide with the thermometer and warm it very much.

If you are researching this, all I can tell you is to not believe what other people are saying about the fact that the higher you get, the colder it is because the evidence is perfectly clear that it is not true.

Source: Prentice Hall Science Explorer Weather and Climate (copyright 2002)

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The coldest layer of the atmosphere is the mesosphere, which sits above the stratosphere and below the thermosphere. Temperatures in the mesosphere can drop as low as -90 degrees Celsius (-130 degrees Fahrenheit), making it extremely cold.


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No, the ionosphere is not the coldest layer of Earth's atmosphere. The coldest layer is actually the mesosphere, which is located above the stratosphere and below the thermosphere. Temperatures in the mesosphere can drop as low as -90 degrees Celsius.


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