Phillip Hunt (via email) asked:
I've been wondering something for a long time:
If someone went out into space and forgot to put on their space suit, would the person feel cold? Within the atmosphere, it feels cold if air
blows across your skin, but in a vaccuum is it possible to feel cold?
My guess is that the water in the person's skin would freeze and make them feel cold, but I really don't know.
Actually, the temperature is colder in space than on Earth, as we have an atmosphere which keeps us warm. So at the same distance as the Earth from the Sun itís about Ė50 degrees in space. On Earth, we lose heat through radiation, evaporation of sweat and by conduction of heat to the air. It is harder to lose heat in space as you can only lose heat through radiation. Electrons in the molecules in our body go from a high energy state to a low energy state, and so lose energy by radiating infra-red radiation.