
Originally Posted by
MattJ.D.
You can't breathe without molecular oxygen, and that does not exist in space, nor can you breathe vacuum. Atomic oxygen does exist in space but that is not breathable even if it was at normal atmospheric pressure. Atomic oxygen, that is oxygen that isn't in the form of di-atomic molecules will not be absorbed by hemoglobin, and in fact it is so reactive it tears molecules apart. In order to breathe we need enough atmospheric pressure for our diaphragms to create first a pressure drop then a pressure increase in the lungs as we breathe. In space the lack of pressure makes this impossible, and a human unprotected from the vacuum of space would die of both suffocation and the 'bends" because bodily fluids start boiling because of the lack of pressure on the body. Gases dissolved in the blood and other bodily fluids will come out of solution, with dire results. With no molecular oxygen and no pressure for our lungs to work with, breathing in the vacuum of space is impossible.
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