|WikiProject Aviation||(Rated Stub-class)|
|WikiProject Spaceflight||(Rated Stub-class, Low-importance)|
- There is no concrete definition for space. SOME consider 60-63 miles space, others, variable altitudes. From the stratosphere article, "The stratosphere is situated between about 10 km (6 mi) and 50 km (30 mi) altitude above the surface at moderate latitudes, while at the poles it starts at about 8 km (5 mi) altitude." The atmospheric pressure at the lower and upper limits of the stratosphere is pretty low, as in REALLY close to vacuum, for the human body. Personally, I consider low Earth orbit space, if you can't orbit, it ain't space. But, that is *MY* definition. I might even consider the biosphere as not space and outside of it so. But, that is MY opinion, not the current scientific consensus or the media consensus.Wzrd1 (talk) 05:30, 4 July 2012 (UTC)
- Blood turns to gas? Afraid not. Your blood is maintained under pressure in your circulatory system. Hence BLOOD PRESSURE, and because of this is maintained above it's vapor pressure. Sorry kids, that means it doesn't boil. Some of the nitrogen in your blood stream MAY turn to gas (the bends) but it's far less severe than what happens during diving. Decompressing from atmosphere to vacuum is the equivalent of coming up from a 34 foot deep dive in water. What DOES boil is the saliva in your nice warm mouth that isn't held under pressure and possibly sweat and other bodily fluids. Just sayin'. — Preceding unsigned comment added by 22.214.171.124 (talk) 21:45, 14 October 2012 (UTC)
- As you noted, decrease in pressure will cause outgassing of dissolved gasses in bodily tissues; including blood. It's not literal fluid actually evaporating from blood due to phase-change, but it does sound like a boiling process to the layperson; think of the rapid excitation of a bottle of carbonated beverage when it's opened. A much smaller scale of that happens when ambient pressure is rapidly lowered. 126.96.36.199 (talk) 19:57, 15 January 2013 (UTC)
- When you go above the Armstrong Line, the atmospheric pressure is so low, that fluid will flow out of any body orifice and vaporise (boil) as it does so. This includes the mouth, anus, urethra and tear ducts. Any fluid in areas open to atmosphere, such as the lungs, penis (seminal fluid) or vagina (mucus) may also start to boil at body temperature. Blood may break through thin membranes in the nose, lungs or eyes and may appear to boil, but it is only the water in the plasma that is evaporating.Nigelpwsmith (talk) 12:29, 19 April 2013 (UTC)
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Can someone please remove the product placement "red bull" from the opening paragraph of this article? Thanks in advance.
The article makes (apparently non-cited) reference to "reentry" and correctly states "the speed of orbit is in the thousands of kilometers per hour", but those few individuals who have performed extremely high altitude skydives are never in orbit but rather jumping from a stationary capsule or airframe of some fashion. Seeing as nobody is really talking about actual orbital reentry outside of a vehicle, does speculation regarding excessive heat and armor really apply? 188.8.131.52 (talk) 19:50, 15 January 2013 (UTC)
What is the reference or source describing Heinlein as a spacesuit designer? I thought he left the Navy before WWII and worked as a writer the rest of his life? If there isn't a source backing this up I would like to remove this claim. — Preceding unsigned comment added by 184.108.40.206 (talk) 03:19, 13 May 2013 (UTC)