If your body was sealed in a space suit, it would decompose, but only for as long as the oxygen lasted. If you were near a source of heat, your body would mummify if you were not, it would freeze. If you do die in space, your body will not decompose in the normal way, since there is no oxygen. LeBlanc's suit sprung a leak, and he remained conscious for about 14 seconds his last sensation was bubbling on his tongue (he was safely revived, as the researchers began repressurising the chamber almost immediately - after about 15 seconds).īecause you will be exposed to unfiltered cosmic radiation, you can expect some nasty sunburn, and you'll probably also get a case of decompression sickness.You would not, however, freeze straight away, despite the extremely cold temperatures heat does not leave the body quickly enough for you to freeze before you suffocate, due to the lack of both convection and conduction. The moisture on your tongue may begin to boil, though, as reported by Jim LeBlanc, who was exposed to near vacuum in a test chamber in 1965. It also won't affect your blood, since your circulatory system is able to keep your blood pressure regulated, unless you go into shock. You won't balloon to the point of exploding, though, since human skin is strong enough to keep from bursting and, if you're brought back to atmospheric pressure, your skin and tissue will return to normal. After about 10 seconds or so, your skin and the tissue underneath will begin to swell as the water in your body starts to vaporise in the absence of atmospheric pressure. The other things, you can't really do much about. The first thing to do if you ever find yourself suddenly expelled into the vacuum of space is exhale. If you do hold your breath, the loss of external pressure would cause the gas inside your lungs to expand, which will rupture the lungs and release air into the circulatory system.
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