One Less Thing To Worry About

According to Damn Interesting, a human being exposed to the vaccum of space without protection will not instantly swell up and explode. I know, you saw OUTLANDER and TOTAL RECALL and that's always the way it goes down, but in fact, it'd be more like this:

For about ten full seconds– a long time to be loitering in space without protection– an average human would be rather uncomfortable, but they would still have their wits about them. Depending on the nature of the decompression, this may give a victim sufficient time to take measures to save their own life. But this period of "useful consciousness" would wane as the effects of brain asphyxiation begin to set in. In the absence of air pressure the gas exchange of the lungs works in reverse, dumping oxygen out of the blood and accelerating the oxygen-starved state known as hypoxia. After about ten seconds a victim will experience loss of vision and impaired judgement, and the cooling effect of evaporation will lower the temperature in the victim's mouth and nose to near-freezing. Unconsciousness and convulsions would follow several seconds later, and a blue discoloration of the skin called cyanosis would become evident.

So you gotta admit, that's good news. Kubrick got it right again. The article goes on to point out that after you lose conciousness and turn blue, you'd still be good for about a minute and a half before they had to get you into the airlock and administer oxygen, and then you'd probably suffer no permanent damage. Of course, past that your blood would boil and that's a hard condition to treat. But hell, you at least have time to wave frantically to the folks inside, maybe tap your keys on the window and mouth the words "let me back in" which is more than we've been told to expect. Small favors!

(hat tip to Mental Floss)