Earth's atmospheric temperature is not what this person is talking about. The temperature outside your door depends on the sun, sure, but it's due to Earth's atmosphere. Go 60 miles towards "up" and the temperature of space is not the 68 degrees it is on the ground.

I think OP is questioning the temperature of the vacuum of space near the Sun. It doesn't really work like that though.

To expand on the "doesn't work like that" part: In the vacuum of space there is no air to exchange warmth with your body, or your space suit. You might be comfy on the side of your body facing the sun (if you're at that distance where it provides the right amount of radiative heat) but the side facing away from the sun will get no heat, and therefore be cold. I imagine that would feel very weird... if you could feel it on your skin, without a space suit, without being ripped apart by the vacuum, of course.

Does anyone know whether this "uneven distribution of heat energy" is a problem for space suits or if that little bit of air inside is enough to distribute it?

Why can some objects exist in space without getting ripped apart like a human would. Is that what actually happens to a human anyways?

There are glacier fed lakes when i live. You can float in incredibly cold water and if you have just the right equilibrium you can half float in freezing cold water while half getting a nice sun bath. And it IS very weird.

One spot I camped at for many years had nice sandy area that was about 200 meters out into the lake before a drop off. As it was only about a meter deep it used to warm up the top foot or so of the water when it was fairly still and you could stick your arm down into the water and actually feel the temperature drop like there was a line underneath the water.

Was great place to camp before it got overwhelmed by mosquitos

Oh wow, that sounds amazing! Apart from the mosquitos maybe.

If I can find some old pictures I'll share

NASA EVA suits have liquid (water) cooling systems to avoid cooking the astronaut while outside the ISS.

I don't know how they actually work though. The only way to shed the heat is to radiate it away or to sink it into warming something else up.

Found this on Wikipedia:

In an independent space suit, the heat is ultimately transferred to a thin sheet of ice (formed by a separate feed water source). Due to the extremely low pressure in space, the heated ice sublimates directly to water vapor, which is then vented away from the suit.

The ice sublimator consists of sintered nickel plates with microscopic pores which are sized to permit the water to freeze in the plate without damaging it. When heat needs to be removed, the ice in the pores melts and the water passes through them to form a thin sheet which sublimates. When there is no need for heat to be removed, this water refreezes, sealing the plate. The rate of sublimation of the ice is directly proportional to the amount of heat needing to be removed, so the system is self-regulating and needs no moving parts. During EVA on the Moon, this system had an outlet gas temperature of 44 °F (7 °C),[1] As an example, during the Apollo 12 commander's first EVA (of 3 hrs, 44 minutes), 4.75 lb (2.15 kg) of feedwater were sublimated, and this dissipated 894.4 BTU/h (262.1 W).[2] The pores eventually get clogged through contamination and the plates need to be replaced.[3]

Though I think that's specifically for removing the astronaut's body heat.

What a great system. I wonder how the development of that worked. Did they theorize the necessity of a system like that or were the first space walkers quite unconfortable?

I'm not a scientist, but I'm pretty sure temperature is the energy given to the molecules in the air by the radiation from the sun. Since there is no air in space to excite, it's just really cold until it's not.

Temperature is how much movement there is at the molecular or atomic level(depending on how you are measuring.

There is a lower limit, but no upper limit on how much heat can be measured.

This is the basis of the Kelvin scale and starts at absolute zero or the temperature at which all movement (energy) stops

Air is a medium. Flowing air is a decent heat exchanger, still air is bad at it

The photons would directly excite the molecules in your body.

Which is why space suits are white. If they were darker, you‘d get cooked on a space walk. In a vacuum, the sunlight can heat you up but it’s much harder to radiate heat away.

Physics sure is exciting!

so hot right now

You just clarified the part where I said, "It doesn't really work like that though." I appreciate you, honey buns.

There's convective and radiative heat, while the first one needs some medium to transmit energy (air...), the second one simply beams it onto you

3 mechanisms for heat transfer: conduction (heat moves from one bit of matter to another when they are touching), convection (in a fluid, hot matter move about), and radiation (pure heat, only form that goes through a vacuum, this is just like lower frequency light that we can't see).

Thanks, I thought conduction was under convection, so to say

Okay, thank you. I’m not a very smart man, and had always wondered how planets can be heated by the sun but not space itself. It never occurred to me it’s because of the vacuum of space that keeps it cold.

Gotta have stuff to be heated. Nothing can't be heated. But the energy that heats stuff can still pass through the space where the nothing is.

Space has no temperature. Space is a vacuum. Temperature needs things to jiggle.

But a thing in space is not a vacuum and is subject to heating via solar radiation

The average temperature of the universe today is approximately 2.73 K (−270.42 °C; −454.76 °F), based on measurements of cosmic microwave background radiation.

https://en.wikipedia.org/wiki/Absolute_zero

Cited from https://www.abc.net.au/science/articles/2003/09/25/947116.htm

The half of you not facing the sun would freeze, even on mercury it gets cold at night

I will simply sit on an office chair and spin around like doner on a rotisserie

Now I want a doner

You can do that without a chair in space.

Spin on it like a rotisserie chicken!

If you've got even modest infrared insulation, though, your metabolism is more than enough to keep you from freezing. No convective or conductive heat transfer makes getting rid of heat more of a problem.

wear a coat

Instead of wasting our resources trying to terraform Mars, we should look for planets already in this "balmy zone" to live on.

Reaching mars is far more achievable than reaching another solar system.

Thankfully there's a planet already in the balmy zone in this solar system, and even better, it already has an atmosphere we can breathe!

You mean like not fucking up the planet we live on? That's impossible, you're insane.

¡terraform earth!

yeah, if we could terraform mars, we could terraform earth too. i'm in the "let's put all the pollution on the moon" camp

Here's an idea, let's clean up our home.

We've had one planet, yes. But what about second planet?

"I don't think he knows about second planet, Pippin."

Literally. It's adorable seeing kids figure things out like that, though :)

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