Why is the coldest layer of the atmosphere next to the hottest layer of the atmosphere?

The coldest layer of the atmosphere is in the Mesosphere. This is because temperatures are decreasing as the Mesosphere extends upward above the Stratosphere. The air is thinner because the air particles are further apart.

The next layer, known as the Thermosphere is the hottest layer. The reason why this layer is so hot, is because it contains fewer air molecules then the other layers, making the air very thin and easy to warm. The Thermosphere is closest to the sun and most sensitive to solar energy which is why it gets hot very quickly.

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