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[–] BenderRodriguez@lemmy.world 140 points 1 day ago (4 children)

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.

[–] JackbyDev@programming.dev 7 points 1 day ago (2 children)

You don't think a function of the temperature from the sun to the earth forms a continuous line? You think it's piecewise? It's continuous! Yeah it probably bottoms out to effectively zero pretty quick, but there's some distance from the sun that would be the right temperature. Sure, the other rays from the sun might not make it livable. Sure, it might be so narrow there's no way to effectively keep yourself in orbit there without getting sucked closer and burning up. Sure, it's a dumb thought experiment, but there's no way there isn't some point where it's comfortable.

[–] chiliedogg@lemmy.world 6 points 19 hours ago (1 children)

The thing about temperature is that it's not instant. Radiation from the sun heats stuff up, and that heat is absorbed by whatever the radiation hits according to its reflectivity and shape, and then lost from conduction, convection, and radiation. The characteristics of what's being heated by the sun and the environment it's in are what determine how hot it gets.

[–] JackbyDev@programming.dev 1 points 17 hours ago

Exactly, so there must be some environment between us and the sun that's comfortable.

[–] BenderRodriguez@lemmy.world 4 points 18 hours ago (1 children)

Empty space is not like our atmosphere. Similar to sound not going through space, empty space is not a medium that can be heated. You can't heat nothing. Heat is excited atoms. You can't excite nothing.

[–] JackbyDev@programming.dev -1 points 17 hours ago (2 children)

The atmosphere does just "stop" either though. It also forms a gradient. There's not a magic barrier where the atmosphere is and isn't. It just gets gradually thinner and thinner. So in the same way there's a Goldilocks spot in the atmosphere where it's a comfortable temperature without being too cold, there must be another one near the sun.

Besides, heat radiation travels through a vacuum. If it didn't then the Earth wouldn't get heat from the sun at all.

[–] PapaStevesy@lemmy.world 4 points 16 hours ago (1 children)

It travels through the vacuum, but it doesn't heat the vacuum, there's nothing there to heat. The "Goldilocks spot in the atmosphere" is on the ground, that's why we live here.

[–] JackbyDev@programming.dev 2 points 15 hours ago* (last edited 15 hours ago) (1 children)

When you're close enough to the sun it heats you enough, because at some point you're so close you'll burn up, and at some point you'll freeze, so there must be a point between them that's comfortable. (And yes that might involve spinning so you don't cook on one side and freeze on the other.)

[–] PapaStevesy@lemmy.world 1 points 6 hours ago (1 children)

Never said it "heats the vacuum".

But the theory that the space (proper outerspace space) in-between Earth and the sun has an even temperature gradient assumes that it does.

[–] JackbyDev@programming.dev 1 points 1 hour ago

I literally never said it's even, only that if you plot it out it would be continuous instead of piecewise.

[–] BenderRodriguez@lemmy.world 2 points 17 hours ago

I'm sorry, but there's so much wrong with what you said that I can't even begin to correct you.

[–] arandomthought@sh.itjust.works 54 points 1 day ago (7 children)

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?

[–] Jarix@lemmy.world 21 points 1 day ago (2 children)

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

[–] mastertigurius@lemmy.world 2 points 1 day ago (1 children)

A lot of nice places in the world that are a joy to be in until the mosquitoes show up. Do we have to have mosquitoes? Can't the world manage without them?

[–] AngryCommieKender@lemmy.world 1 points 5 hours ago (1 children)

We're gonna find out one way or another. They already released genetically modified mosquito into the normal mosquito population several years ago. If everything goes to plan, those specific species of mosquitoes, that also happen to bite humans, should completely die out in the next 100-200 generations.

I have no idea how short a mosquito generation is, but I suspect that means 50-200 years.

[–] mastertigurius@lemmy.world 2 points 2 hours ago

Entomologists will always be happy to write about it.

Let's say about a 50 day lifespan, that's roughly seven generations in a year, so maybe about 14 years? If the bitey mosquitoes aren't gone, at least the worst of the world leaders should hopefully be dead by then.

[–] arandomthought@sh.itjust.works 1 points 1 day ago (1 children)

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

[–] Jarix@lemmy.world 2 points 1 day ago

If I can find some old pictures I'll share

[–] deadbeef79000@lemmy.nz 31 points 1 day ago* (last edited 1 day ago) (1 children)

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.

[–] Akasazh@lemmy.world 10 points 1 day ago

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?

[–] Honytawk@feddit.nl 4 points 1 day ago (1 children)

What if we spin around like a spit roast so the heat gets evenly distributed?

How fast should we spin as well?

[–] BigDanishGuy@sh.itjust.works 2 points 1 day ago

I wonder what it would do in relation to vertigo. I mean there's no gravity to affect the vestibular system, but there are strong visual cues.

Ah crap, I'm going to go down a "what happens when an astronaut spins" rabbit hole today, ain't I? I had shit to do, oh well

[–] Mesophar@pawb.social 1 points 19 hours ago

But imagine the side facing the sun is comfortable. Then it keeps warming up. And it keeps warming up. And you try to cool down, but it doesn't cool, it just stays the same temperature or keeps warming up.

[–] general_kitten@sopuli.xyz 1 points 20 hours ago

the uneven heating would likely feel like being next to a fireplace

[–] And009@lemmynsfw.com 3 points 1 day ago

This uneven heat distribution confuses the brain and is perceived as pain. Veritasium (or maybe vsauce) did a video on it. Putting frozen and warm hotdog against the skin.

[–] Rekorse@sh.itjust.works 4 points 1 day ago (1 children)

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

[–] PoopingCough@lemmy.world 6 points 1 day ago* (last edited 1 day ago) (1 children)

Ever seen a picture of a blobfish in it's deep ocean habitat vs when it is at the surface? It's body is adapted to the extreme pressure of the deep sea, and when that pressure is no longer there, the forces keeping it's shape are no longer present and thus every bit of it expands. That's what would happen to us in the vacuum of space albeit on a lesser scale. Also, we're like 70% water which boils in a vacuum.

[–] SmoothOperator@lemmy.world 3 points 1 day ago (1 children)

As I understand it, this in fact will not happen. Our circulatory system is a closed loop and strong enough to not expand into vacuum. The water inside our body is kept close to usual pressure by our skin, blood vessels etc.

The main immediate danger in space without a spacesuit would be holding your breath. Your lungs are not built to withstand a whole atmosphere of pressure from the inside, and will get damaged if you hold your breath.

Of course if you don't, you'll have another problem.

[–] PoopingCough@lemmy.world 1 points 15 hours ago (1 children)

Thanks for the clarification. I knew the whole lungs problem and that was really what I had in mind but just kind of assumed there'd be similar dangers to other bodily functions but I see that's not the case.

I do believe the water would still be an issue for your eyes and maybe even mouth but good to know you wouldn't immediately have blood literally boiling in your veins.

[–] SmoothOperator@lemmy.world 1 points 4 hours ago

I agree that the water exposed to vacuum would evaporate over time, but I'm not sure it would be directly harmful beyond the dehydration.

[–] chemical_cutthroat@lemmy.world 6 points 1 day ago (5 children)

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.

[–] WalrusDragonOnABike@reddthat.com 10 points 1 day ago (2 children)

The photons would directly excite the molecules in your body.

[–] dfyx@lemmy.helios42.de 11 points 1 day ago* (last edited 1 day ago)

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.

[–] luciferofastora@feddit.org 5 points 1 day ago (1 children)
[–] crazycraw@crazypeople.online 7 points 1 day ago

so hot right now

[–] Hadriscus@jlai.lu 4 points 1 day ago (1 children)

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

[–] Sadbutdru@sopuli.xyz 2 points 1 day ago (1 children)

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).

[–] Hadriscus@jlai.lu 1 points 1 day ago

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

[–] BenderRodriguez@lemmy.world 4 points 1 day ago

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

[–] Jarix@lemmy.world 2 points 1 day ago

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

[–] dohpaz42@lemmy.world 3 points 1 day ago (1 children)

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.

[–] Sadbutdru@sopuli.xyz 2 points 1 day ago

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.

[–] chemicalprophet@slrpnk.net -5 points 1 day ago (1 children)

Lemmy.world amirite?!! Well akshually…