this post was submitted on 19 Nov 2024
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Space doesn't really have a temperature as you need something to be hot or cold! And in the vacuum there isn't much.
So just unforgiving vacuum.
My brain just imploded from that realisation and it troubles me.
I can intellectually reconcile what you said, but my reptilian brain cannot comprehend the phenomenon for whatever reason.
I instinctively don't believe that the radiation only is how heat is transferred in the vacuum even though I know that this the case. We always have had 3 (convection, conduction and radiation), and that stumps me.
Heat transfer by radiation complicates things. We lose the majority of our heat that way, and we'd lose a lot more if every cubic inch of the spaces we inhabit weren't flooded with thermal radiation from the objects that surround us.
You can absolutely judge the temperature of a volume, vacuum or not, by its radiation content at any given moment.
You're describing a thermal balance. Temperature is a property of matter which doesn't exist in a perfect vacuum. That said, the space around ISS is far from a perfect vacuum (atomic oxygen sucks). In any case, the typical temperature model starts to breakdown with increasing vacuum.
Sure, but in any practical sense it is a temperature. It would be silly to say space isn't cold (or hot depending) from a regular person's perspective. Thermal balance creates an effective temperature, even if it wouldn't be described as a temperature within some technical frame of reference.
That's a fair point.
If you really play with definitions you can equate cold to things that are thermal insulators and hot to things that are conductors. By that (very stretched) definition a vacuum is cold. Perfectly cold.
The stretching: Even if something is like a thousand degrees but it's a near perfect thermal insulator, it won't feel that hot when you touch it.
It's not cold physically, it's cold emotionally.