Hey everyone, I have a physics question that I'm wondering if someone could help me guesstimate the answer to. This isn't a homework problem or anything, just something I'm curious about. Ok, we all know outer space is very cold, approximately 2.7 degrees K (-270C or -455F). We also know that outer space is very empty, containing only a few hydrogen atoms per cubic meter (while the air we breath contains about 10^25 molecules per cubic meter). I know that if I were to stand outside in 20F air that I would get cold fairly quickly. If you were to put me in 20F water it would draw heat away from my body about 25 times faster than being in the air alone. So even though space is very cold, it doesn't have many molecules with which to draw the heat from my body. So here is my question... Assuming I were to leave my space shuttle in deep space and were completely naked how long would it take for me to freeze to death? Lets assume that somehow the lack of oxygen and any pressure affects were the least of my concerns. All I'm interested in is how long would it take for me to freeze to death. Extra points if anyone can put it in the form of being in a similar temperature on earth. For example... Being in outer space would be equivalent to being in -200F air here on earth. I have a feeling there is some sort of formula you can use to solve this problem, I just don't know it. Thanks for indulging my curiosity.