Astronauts do not suffer from cold conditions despite the fact that scientists have measured a temperature of -523 F (-273 ° Celsius). On Earth, the definition of the temperature is expressed by the measurement of the thermal agitation of the molecules. The higher the temperature, the more the molecule agitation average increases and creates a feeling of warmth in contact with our skin. But in space, there is no molecule. Therefore, the energy transfer through the molecules no longer works. Only the radiation transfer remains. But our body has its own source of energy and before it is cooled by simple radiation it will take dozens of hours. This cooling process is further slowed down by the tightness of the spacesuit.
When traveling by plane, we always have the feeling that the higher we climb, the lower the temperature. Here again it is rigorously wrong. The higher the elevation of the terrestrial atmosphere is reached the more the temperature is getting quite intense. At the frontier between the thermosphere and the exosphere, which is around 310 miles (500 km) above the sea level, scientific measured a temperature of more than +2900 F (+ 1600 ° Celsius). We can not say it’s cold.
The moon that many imagine as icy can reach +253 F (+123 ° Celsius) on its ground. This is mainly due to solar radiation. The same principle as in the mountains, the higher the altitude, the more the sun’s rays become aggressive and force us to protect ourselves. Spacesuits are therefore white in order to be able to reflect the sun’s rays as efficiently as possible and avoid overconsumption from the air conditioning system.