How long could a human stay conscious in space without a suit?
- 15 seconds
As we are all getting ready to strap on our space suits and head out to life on Mars, we may want to consider the possibility that life in space isn't all it is cracked up to be (as in you only get about 15 seconds of consciousness without a spacesuit). If you happen to be floating around space with someone in a suit then awesome. You still have about another minute and 45 seconds to get back into your space shuttle before the water in your soft tissue vaporizes. You'll swell up like a boiled hot dog and though your eyes won't explode, they will start to emanate smoke from the release of gas and your tongue will boil. But other than that, everything will be fine. Source: Scientific American
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