Temperature Comparison

[Corkeyno2]

Hi guys, I made a new video about the temperature of a few things. I hope you enjoy it!

 

[laudropb]

Very nicely presented.

[Corkeyno2]

Just now, laudropb said:

Very nicely presented.

thanks

[faulksy]

brilliant and interesting, thank you

[SilverAstro]

I've only got as far as the m.p. of Mercury because someting is bothering me and I stopped to think about it ! :--

What is your source for SagA* and Boomerang ?  because the Microwave Background is all around us and permeates the universe, so at equilibrium * everything should be at that temperature ?

* but some things are not at equilibrium, active things like stars and boy scouts rubbing sticks together but to get colder ?? needs to be actively cooled in a freezer in the laboratory = liquid Helium.

So I need to look up your source for how those two become colder than the Microwave Background all around them ? Please

 

[Corkeyno2]

35 minutes ago, SilverAstro said:

I've only got as far as the m.p. of Mercury because someting is bothering me and I stopped to think about it ! :--

What is your source for SagA* and Boomerang ?  because the Microwave Background is all around us and permeates the universe, so at equilibrium * everything should be at that temperature ?

* but some things are not at equilibrium, active things like stars and boy scouts rubbing sticks together but to get colder ?? needs to be actively cooled in a freezer in the laboratory = liquid Helium.

So I need to look up your source for how those two become colder than the Microwave Background all around them ? Please

 

Got this quote from a website:   "The Boomerang Nebula is like a cosmic refrigerator, in which expanding gas cools very efficiently down to the very chilly temperatures we have found."

https://www.jpl.nasa.gov/releases/97/coldspot.html

 

[SilverAstro]

20 minutes ago, Corkeyno2 said:

Got this quote from a website:   "The Boomerang Nebula is like a cosmic refrigerator, in which expanding gas cools very efficiently down to the very chilly temperatures we have found."

https://www.jpl.nasa.gov/releases/97/coldspot.html

 

Thanks, facinating ! It seems that it is expanding (and thus cooling) too quick for the Microwave Background to warm it up (ie. not yet! at equilibrium )

Meanwhile I have found this on the good'ol BBC which says much the same :- http://www.bbc.co.uk/earth/story/20140916-the-coldest-place-in-the-universe

Learn something every day ! Thanks Corkey.

 

[Floater]

Wonderful stuff! Thanks, Corkey.

[SilverAstro]

ok found it   SagA* is usually referred to as the bright radio and X-ray source at the Milky Way centre (very hot!) So far so good, thought to be the accretion disk surrounding a massive black hole (but not quite as supermassive as in other galaxies.)

At the surface of the black hole at the centre of SagA* the temperature is presumed to be nothing very much at all except for very weak Hawking radiation, "at a negligible temperature on the order of 10^−14" https://en.wikipedia.org/wiki/Sagittarius_A*

So that's ok then, I can get on with watching the rest of your vid

 

[cloudsweeper]

Good job, Corkey!  What a range.  Good point about just going over to K.  And 57C on Earth - don't fancy that!

Doug.

[Corkeyno2]

30 minutes ago, cloudsweeper said:

Good job, Corkey!  What a range.  Good point about just going over to K.  And 57C on Earth - don't fancy that!

Doug.

Thanks! I think the 57C was in death valley, which is probably why it has that name lol.

[SilverAstro]

Thank you, very interesting. Cold stars indeed, whatever next