How can outer space be cold?

[Yoga Face]

I suggest you watch some Big Bang Theory episodes to brush up on physics before you post here. Like I have!

My peeve against Terbites is too many of them try to see Peccadilloes in other Terbs then brag about their intellectual ( perceived or in fact it does not matter) superiority

IE attack one bad drunken post and label them idiots after many excellent posts or in this case insult me because I was not aware of a recent physics concept


Anyways life is too short '.............

BTW you can do the double slit interference pattern thingy at home all you need is ........

You see the pattern is one of waves interfering with each other

An electron gun fired at two slits produced this same pattern but when observed ( wth instruments) coming out of the slit the electrons coming out of the slit changed their pattern to that of a particle
It is like the electron knows it is being observed so it changes into a particle

 

[Yoga Face]

My pet peeve is that I am not a good enough writer of humour for my jokes to have their desired effect.

In this case I was trying to be funny by suggesting that watching the hit COMEDY show "Big Bang Theory" in which the two main characters are physicists, would confer all that one needs to know to post intelligently (LOL!) on TERB.

For the sake of TERB CIVILITY we need BETTER smileys!

I was referring to basketcase but I am over sensitive. It is a weakness

 

[GrandBlasterK]

BTW you can do the double slit interference pattern thingy at home all you need is ........

Can I do a "double clit" experiment with two lesbos and fire my load in two clits at the same time? Is that even physically possible?

 

[GrandBlasterK]

This equation falls apart very rapidly at low pressures and low molar count - it will collapse pretty much into 0/0, its sort of like trying to use conventional physics to explain quantum physics - not gonna happen.

I get it. It's like when my cock has low pressure, it will produce low/zero sperm count. Conventional biology can be used to explain quantum chemistry.

 

[basketcase]

And you get to be insulted ! No I am not a physicist, (and I am not arguing) I have no such pretensions, and I appreciate any correction .Thank you
...

Whether you intended it or not, your post came off as disbelieving that light/EM radiation is able to travel through a vacuum which has been completely disproven. If that was your intent, you are flat out wrong.

As far as the duality, it is well accepted that light has both wave and particle like properties and that the properties you see depends largely on the type of test you do.

 

[Yoga Face]

That’s quite a deep question, If you go back to the big bang, if you look in any direction, you’ll see something. If you look in any direction far enough and there’s no stars in the way, you’ll see a big soup of atoms which were created after the big bang. This light was emitted when electrons were collected by hydrogen atoms. When they did that they released lots of energy and photons, very high energy light. This is well into the gamma rays. Because the universe has expanded so much and these gamma ray photons which are incredibly hot, thousands and thousands of degrees centigrade, have slowly been stretched as the universe has stretched. Their wavelength has got longer and longer. With that they’ve got colder and colder because longer wavelengths are lower energies. They’ve got stretched so much that their temperature is about 2 or 3 degrees above absolute zero. It’s about -270 degrees centigrade.

You got a degree in physics ?

 

[fuji]

No place to radiate your heat into so you should remain at the same temperatue ?

What do you mean no place to radiate your heat into? You will radiate it into the vacuum around you. You will not transfer heat via conduction, but you WILL still radiate it. Google "black body radiation".

 

[Moraff]

Gooooood answer Moraff

So we radiate heat in the form whence it came - invisible light waves !

Heat will travel in whatever manner is available to it. If you take a human that is warmer than his/her surroundings heat will be leaving them by all 3 methods: radiation, convection and conduction (assuming the subject is standing, sitting or lying somewhere that has a gas surrounding them of course )

Those "invisible light waves" are more correctly termed "electro-magnetic radiation" and it all depends on what temperature an object is radiating at as to whether the EM radiation is invisible to our eyes or not. Humans give off EMR at infrared frequencies only but an iron bar heated to the point where it is glowing red-hot is giving off EMR from the infrared part of the spectrum up into the visible red light frequencies.

So this means we will freeze solid in space as we lose our heat (but this will take time) as there is very little conduction, or convection ,occurring, I think

That conclusion would also assume that we are not receiving heat at a rate quicker than we can lose it. If said human was exposed to sunlight whilst in orbit around the earth they would be cooking on the sunlit side and freezing on the shadowed side.

This is why the shuttle - which spends a lot of it's mission in sunlight - flys upside down with the bay doors open. There are huge radiators in the doors to help cool the shuttle. IIRC Skylab crew had to rig a temporary "parasol" to shade the satellite until they could get the malfunctioning solar/radiation shield to deploy properly.

 

[Yoga Face]

What do you mean no place to radiate your heat into? You will radiate it into the vacuum around you. You will not transfer heat via conduction, but you WILL still radiate it. Google "black body radiation".

I meant to say conduct not radiate

You will lose only a small amount of heat through conduction and convection and eventually will freeze solid by this process but it would take some time as there is little matter in space to conduct into (assuming there is no sun radiation to warm you)

So my question was do we radiate heat in electromagnetic waves and it appears the answer is yes

 

[nottyboi]

Cold is the absence of heat.

Is ugliness also the absence of hotness?

 

[fuji]

So my question was do we radiate heat in electromagnetic waves and it appears the answer is yes

Yes we do. The rate of heat loss is slower than via conduction, but slowly but surely your body temperature would drop to near absolute zero in space, unless something like the sun were heating you up.

 

[GPIDEAL]

For the sake of TERB CIVILITY we need BETTER smileys!

I agree. A SIGH smiley is long overdue!

 

[GPIDEAL]

It is simple

If it is not mass it is energy

There is nothing else

Are you sure? What about in General Relativity? What about quantum mechanics? (I thought E=MC2 was special relativitiy theory?).

 

[burt-oh-my!]

One thing I would like to clarify or re-ask from my original post - if you stretched out your arm in space, (lets say you are in shadow) - how would it FEEL?

From what I have learned from these posts (i.e. slow loss of heat) it might in fact not feel particularly cold at all.

 

[burt-oh-my!]

Also, I presume the incredible and complete dryness would be damn tough on the 'ole eyeballs.

 

[Yoga Face]

One thing I would like to clarify or re-ask from my original post - if you stretched out your arm in space, (lets say you are in shadow) - how would it FEEL?

From what I have learned from these posts (i.e. slow loss of heat) it might in fact not feel particularly cold at all.

The other effect would be loss of air pressure

Lower air pressure quicker liquids boil so I suspect your saliva would boil immediately but your blood would not until you lost your blood pressure

Also the air in your lungs would expand and blow up your lungs because of air pressure difference

 

[Yoga Face]

Are you sure? What about in General Relativity? What about quantum mechanics? (I thought E=MC2 was special relativitiy theory?).

Yes it is but I think I am right

There is energy and there is mass there is nothing else

Am I right ???????

 

[Yoga Face]

Put a marshmallow in a bell jar and suck out the air, or a balloon. This is what would happen to you, your arm or any elastic (relative) pressure vessel in about a minute. There have been experiments done on animals (sadly). The dissolved gasses in your blood begin to expand, but long before that you'll be unconscious.

http://www.youtube.com/watch?v=tq6_E8blo8U


You would feel PAIN, forget cold or hot.

Yes but these effects are not instantaneous

Refer to post 25

Dave is in outer space without a space suit for 30 seconds and survives quite nicely

I presume Dave emptied his lungs so they would not blow up and felt the siliva on his tongue boil and his eyes dried up

Kubrick was careful to be scientifically accurate

 

[Yoga Face]

No you aren't.

There is TIME.

Will you pick up a book on quantum physics already.

HMMMMMMMMMM ... I do not believe time is a constant like mass and energy . At the speed of light time does stops flowing but matter still exists and and so does energy ?

Also our concept of forward flowing time is entropy at work but time can also flow backwards, indeed why does time flow forward ( or entropy increase) as the universe expands ???? There is no law that insists time flow forward ( or entropy increases) If the universe goes into a big crunch will entropy decrease and time flow backwards ??

Will not the universe expand until entropy stops so time will stop but there will still be mass?
( but no energy only the potential for energy ?)

 

[Moraff]

One thing I would like to clarify or re-ask from my original post - if you stretched out your arm in space, (lets say you are in shadow) - how would it FEEL?

From what I have learned from these posts (i.e. slow loss of heat) it might in fact not feel particularly cold at all.

Are you exposing your arm to vacuum? If not, then what you would feel would be like sticking your arm in shadow on earth (to some degree). It will all depend on what the rate of heat transfer is of the material enclosing your arm. If it is just a layer of plastic I would imagine you would start to feel very cold very fast. If you had the equivalent of R40 insulation you would be losing heat much more slowly and therefore wouldn't feel as cold.