|Taja the Barbarian|
Taja the Barbarian wrote:Aenigma wrote:
...By the way, I have learned in several films that space is a very cold place. You'll freeze to death with unprotected exposure to outer space.
Technically speaking, space isn't actually cold: It's basically a vacuum, which means you'll retain your body heat quite well as there is nothing around you for Conduction or Convection to occur. On a practical level, keeping cool is a much bigger issue in space exploration than heating is.
Ehhh background space temperature is something less than 3 kelvins, which is something less than 3 degrees above absolute 0.
i'd say that is actually pretty effing "cold".
that said, without matter, the only way for heat to transfer (either way) is radiation, so it's not as fast as movies/comics depict.
still, for long exposure you do need thermal protection, both against losing heat (and freezing to death) and gaining heat (and burning to death), depending where you are compared to the sun. Good thing that space suits come with those^^.
The issue is that the average mass density of the cosmos is estimated to be the equivalent of less than 5 protons (yes, we are talking sub-atomic particles here) per cubic meter, so calling space 'cold' is kinda like calling a stadium 'hot' because there is a single lit candle in it.
A true vacuum doesn't actually have a temperature, as this term just doesn't apply when there is no matter. Space does have some matter in it, but it's still really, really, really, really, really, really empty, so it would probably interact with you like a dropping a grain of sand in a lake: Regardless of the grain's starting temperature, it just doesn't have to mass to significantly impact the lake's temperature.
If a fantasy character's body was magically safeguarded against a (near or total) vacuum environment, he'd probably sweat like crazy as his body attempts to dump excess (self generated) body heat: Presuming his magic does not protect his secretions, this might actually work for while as his sweat will instantly vaporize in a vacuum (taking some heat with it), but he'll dehydrate really quickly without additional magics...
Once he deals with this, then he can worry about cosmic rays and other radiation sources cooking his cells...
Space: No part of it wants you there...