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/sci/ - Science & Math

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2650651 No.2650651 [Reply] [Original]

You freeze automatically when exposed to the vacuum of space.

False. Space is very cold, but objects in a vacuum cool down extremely slowly. The heat in the object has to go somewhere. On Earth, the heat would be transferred to the cold surroundings, such as the air, by contact. In a vacuum, there is nothing to transfer the heat to, so objects that are warm stay warm for a long time. This is the principle behind vacuum flasks. The only way a object in a perfect vacuum can cool down is by electromagnetic black-body radiation. A person would radiate about 1000 Watts (57 BTUs per minute) in this situation, which is only about 7 times more than they would radiate in a 68 F room.

>> No.2650654 [DELETED] 

10/10

I learned something

>> No.2650662
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2650662

>>2650651
>mfw 1000 watts

>> No.2650665

wow I was wondering this exact thing today OP

10/10

>> No.2650667

>>2650651
The enormous underpressure will still fuck you up though.

>> No.2650668

Great! Now to work on that whole suffocation thing...

>> No.2650681

it's not about freezing to death, if anything it's about boiling away from the lack of pressure.

>> No.2650683

>>2650668

And pressure... And radiation...

Space is hostile as fuck.

>> No.2650688

>>2650681
your skin is elastic enough to keep the internal pressure of your body from dropping enough such that the water in your body boils.

>> No.2650694

Al Gore did not invented the internet.

>> No.2650699

addendum: you'd die from asphyxiation in a vacuum faster than any other reason. Just ask the guy whose suit failed in an earth-based vaccum chamber and lived to tell the tale.

>> No.2650700

>>2650667
Another misconception: You explode when exposed to the vacuum of space.

What actually happens is that your skin puffs up and you die not from the pressure but from suffocation. Also there's possible lung damage if you decompress too fast.

>> No.2650701
File: 27 KB, 331x334, 1295071242230.jpg [View same] [iqdb] [saucenao] [google]
2650701

>>2650688
the fuck am i reading?

>> No.2650729

your eyeballs explode and you freeze to death in ten seconds. then your body shatter to pieces when it hits something, hollywood teached this to me.

>> No.2650739

>>2650699

IIRC the dude passed out right after he felt the saliva on his tongue boiling.

>> No.2650744

>>2650729
>hollywood teached this to me.
I nearly spat out my coke.

>> No.2650749

>>2650744
nearly sneezed out mine

>> No.2650760

>1000 Watts
I actually estimated this before and the actual figure is like an order of magnitude less.

>> No.2650773

>>2650651
LOOK, YOU'D DIE QUICK AS FUCK
/THREAD

>> No.2650792
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2650792

Misconception:
The Big Bang happened at a point, and everything is moving away from that point.

The Big Bang happened everywhere, and the universe is, as far as we can tell, infinite. A singularity doesn't mean a point; it means that the laws of physics as we know them break down, and more accurate laws we don't know apply. There is no center or edge. From any galaxy's perspective, other galaxies are moving away from it.

>> No.2650806

>>2650792

Wheres this gif from?

>> No.2650807

if you start out in a line anywhere in the universe and travel on that line for long enough, you will eventually end up where you started. the universe is like a giant sphere.

learned that in a brief history of time.

>> No.2650812

>>2650806
I made it myself.

>> No.2650816

>>2650792
Well, if everything is expanding from a point, can't basic linear algebra be used in determining the direction of travel of two macroscale objects at the opposite edges of our visible universe, using the angle between the two expansion, and draw the lines until they connect at a point, presumably, the origin of the big bang?

Then we could have a rough estimate as to how huge the universe actually is.

>> No.2650817

>>2650812

I want to do that! What did you use?

>> No.2650820

>>2650807
That's only true if the universe is closed (<span class="math">\Omega > 1[/spoiler]). But <span class="math">\Omega = 1[/spoiler] to the best of current measurements.

>> No.2650821

Misconception: Time is the 4th dimension

Time is a man-made object. It is not a spacial dimension, though it can be a regular dimension (but then again, so can anything, really)

>> No.2650835

>>2650821
You're just wrong. Time is a dimension of 4D spacetime just as the three dimensions of space are. The laws of physics are invariant under rotations in the tx- and other planes. It's true that time isn't a *spacelike* dimension, but that's an entirely different statement than your idea that it isn't a spatial dimension.

>> No.2650850

>>2650820
the fuck is omega?

>> No.2650861

>>2650850
Energy density of the universe divided by the critical density.
http://en.wikipedia.org/wiki/Friedmann_equations#Density_parameter

>> No.2650868

>>2650651
I was actually JUST reading about this.

>> No.2650870

>>2650850
http://en.wikipedia.org/wiki/Shape_of_the_Universe#FLRW_model_of_the_universe

>> No.2650872

>>2650817
Just a quick Python script calling the PIL, and ImageMagick to put the frames together.

>> No.2651333

>>2650872

cool, thanks man!