This first thing that Kills a human in Space?

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Discussion Overview

The discussion revolves around the question of what would be the first cause of death for a human exposed to the vacuum of space without protection. Participants explore various factors such as temperature, lack of oxygen, pressure changes, and other potential hazards, considering both theoretical and experiential perspectives.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants suggest that temperature would be the primary concern due to the extreme cold of space.
  • Others argue that pressure changes would lead to internal rupturing and that the blood would boil due to reduced pressure.
  • Several participants emphasize the lack of oxygen as a critical factor, noting that a human can survive for only a few minutes without it.
  • There is discussion about the rate of cooling in a vacuum, with some noting that without a medium to conduct heat, cooling would be slow.
  • Some participants reference external sources, including articles from Scientific American and other scholarly articles, to support their claims about the effects of vacuum exposure.
  • Humorous and speculative contributions include the idea of being killed by aliens or boredom in space.
  • Concerns about the plausibility of scenarios depicted in films, such as the reentry scene from "2001: A Space Odyssey," are raised, with critiques of the scientific accuracy of those portrayals.

Areas of Agreement / Disagreement

Participants express a range of views on the primary cause of death in space, with no consensus reached. Some prioritize lack of oxygen, while others focus on pressure or temperature as the main threats. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants acknowledge various assumptions, such as the instantaneous nature of exposure to vacuum and the effects of pressure changes on the human body. There are also references to the limitations of existing knowledge and the need for further experimental validation.

Zdenka
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Sorry I can't find any information on this.. Never mind the how, but if one were to suddenly find themselves floating naked in the vacuum of space what would be the thing that will kill them first?

Would it be:
* Plummeting Temperature
* Lack of oxygen
* Pressure (or lack of it)
* Radiation
* Fear

I'm guessing temperature since it's extremely cold in space, but my friend says pressure (wtf?!)
 
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As opposed to the second thing that kills a human in space?
 
but you can only die once!
 
You only live twice,
or so it seems,

I think it's pressure...the blood will boil.

Thats probably rubbish.Perhaps an experiment is called for.
 
Blood would boil? You mean chill, because it's going to be freezing.
 
But cooling wouldn't be instantaneous and boiling point reduces with pressure.
 
Lack of oxygen would kill you.
 
moose said:
Lack of oxygen would kill you.

But how quickly?I just tried an experiment by taking a really high jump in the garden and i am happy to report that I am alive and kicking and as handsome as ever.
 
moose said:
Lack of oxygen would kill you.
A human being can live for 5 minutes without oxygen but at minus 275 degrees Celsius, I think they'd become brittle far sooner than that.
 
  • #10
Zdenka said:
A human being can live for 5 minutes without oxygen but at minus 275 degrees Celsius, I think they'd become brittle far sooner than that.
Without a medium to carry away heat, cooling doesn't happen very fast.
 
  • #11
Zdenka said:
A human being can live for 5 minutes without oxygen but at minus 275 degrees Celsius, I think they'd become brittle far sooner than that.

But there are no air particles to conduct or convect away heat, so the only mechanism of cooling would be via radiation (which is slow). there's also the possibility of adiabatic cooling due to the expansion of your body's volume, but I don't think that would be significant.
 
  • #12
<< post edited slightly by berkeman >>
Zdenka have you tried approaching NASA?
 
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  • #13
  • #14
It depends on how fast you establish "vacuum". If it were instantaneous, you would definitely expand, tearing tissues apart. Have you never felt pressure change in your ears ?

edit
The article indeed says that you would not "burst apart". Interesting...
 
  • #15
HallsofIvy said:
After googling on "NASA" "survival in space" I got this from our own dear Scientific American:
http://www.sciam.com/article.cfm?id=survival-in-space-unprotected-possible
Warning: there are descripitions of rather distressing experiments on animals.

They seem to think that internal rupturing from loss of pressure would kill you first.
Safe to say the cerebral edema (not to mention the complete loss of all organ function) and loss of oxygen would result in rapid death. Unconsciouness would precede death.
 
  • #17
russ_watters said:
Without a medium to carry away heat, cooling doesn't happen very fast.

I'd suggest The Amazing Madame Zelda using a 1 yard wheelbarrow.o:)
 
  • #18
My money is on getting ran over by a satellite.
 
  • #19
turbo-1 said:
The article references this scholarly article on the medical effects of explosive decompression.

http://www.geoffreylandis.com/ebullism.html
Clarke got it about right in 2001. You would survive about a ninety seconds, you wouldn't explode, you would remain conscious for about ten seconds.
I have always wondered about Bowman's explosive decompression stunt. I don't expect Myth Busters will be attempting to verify this one with a human show host.
 
  • #20
Topher925 said:
My money is on getting ran over by a satellite.
Or a piece of one:
Space Station Evacuated Due to "Red" Debris Threat
http://news.nationalgeographic.com/news/2009/03/090312-space-station-evacuate.html
 
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  • #21
Starvation? I don't think there's any food out there. And even if there is, there's no wine to go with it.
 
  • #22
Your eyes would dry up a little quickly!
 
  • #23
Wow you guys missed the most obvious one, everyone knows it will be aliens, I'm betting on Klingons or Kzinti.
 
  • #24
One forgot 'boredom' on the list in the OP. There's almost nothing in space, and interesting places are rather far away.

Is one planning a trip soon?
 
  • #25
Astronuc said:
One forgot 'boredom' on the list in the OP. There's almost nothing in space, and interesting places are rather far away.

Is one planning a trip soon?
Out in hard vacuum with no space-suit? I doubt that boredom would be much of a problem.
 
  • #26
jimmysnyder said:
Starvation? I don't think there's any food out there. And even if there is, there's no wine to go with it.
Wow. Remind me to get out of your way when in route to a meal.
 
  • #27
Was Dave's reentry to the station in the movie 2001 possible?

I tried to find a clip but the only one spotted ends right at the critical scene. Basically what happens is that Dave just holds his breath. IIRC, he enables the explosive bolts on his space pod, which blows him into an external entry chamber of the station. At that point he manages to get a door open and move inside the station within a few seconds. He then enables air pressure to the entry containment area.
 
  • #28
Ivan Seeking said:
Was Dave's reentry to the station in the movie 2001 possible?
Very plausible per the link posted earlier, which says you'd have 9-10s before losing consciousness. Bowman did it ~within that time frame, so AC Clarke wrote it correctly.
http://www.geoffreylandis.com/ebullism.html
 

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