While particles (molecules) in the thermosphere can get at hot as 1700 degrees Celsius, they are few and far between. Additionally air temperature is a measure of kinetic energy of air particles (molecules) not the total energy stored within the air space. The air in the thermosphere is very thin (the few particles) there is little kinetic energy and can not be compared to air closer to the earth. Although the measured temperature is very hot, the thermosphere would actually feel very cold to us because the total energy of only a few air molecules residing there would not be enough to transfer any appreciable heat to our skin. Therefore the overall temperature feels cold (not that you would have exposed skin) if you got hit by one of the particles it would burn right through you. Hope this answers your question.
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