this post was submitted on 02 Aug 2026
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I've been hearing a lot of talk about using satellites for data processing lately. The benefit is better energy generation as I have understood it. But isn't there a problem in that satelites are bad at expelling excess heat, since they can only do so passively?

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[–] Treczoks@lemmy.world 11 points 1 day ago

No, they are not. Putting a data center in space is a completely ridiculous idea. You can probably build and run hundreds of data centers on earth for the price of one in orbit.

I'd really like to know who put this utter nonsense idea in circulation. Wouldn't be surprized if it was Elons idea...

[–] Lemmert@reddthat.com 5 points 1 day ago

Data processing in space can be useful, albeit not in the way that Musk seems to sell it. I spoke with some people from a space startup (edgx) at a jobfair in Belgium half a year ago.

Their thing was that they did some data processing in space to cut down on bandwidth. I also remember specifically asking them about cosmic rays and they told me it's definitely manageable because their computers fly in LEO. (They already have a computer in space)

[–] inbn@lemmy.zip 2 points 1 day ago
[–] noobdoomguy8658@feddit.org 2 points 1 day ago (2 children)

Can any kind strangers here share some reads (or anything) on heat dissipation in space? My understanding is that there is virtually no medium to carry away all that energy, but I remember reading something about satellite and space stations actually cool off and there being some sort of a solution to heat. I just wanna learn more.

[–] drath@lemmy.drath.ru 4 points 1 day ago* (last edited 1 day ago) (1 children)

ELI5 version: You know how things glow red when heated up? That takes energy, or, more precisely, that converts heat energy to light. And you know how the color changes the hotter it is? Even before its starts to glow red it actually still glows, pretty much everything does, we just dont see it because it falls outside of visible spectrum, but thermal cameras can and that's how they work. So, for space question, just take a big plate, and unlike solar panels, point it perpendicular to the sunlight. Run some coolant through it and you've got a space chiller. If you look at i.e. ISS photos you'll see big solar arays at the sides and smaller jagged square panels protruding off the middle and some off the sides, those are exactly it, the so-called "heat rejection units". Actually while double checking myself I was surprised to learn that they do not run a thermal pump between radiators and everything else, I always thought they did as hotter objects dissipate more energy, but apparently shipping more radiators to orbit was a better tradeoff than constantly wasting energy pumping the heat away.

[–] ToxicWaste@lemmy.cafe 0 points 1 day ago

this website covers heat and cold pretty well in my opinion: https://www.jameswebbdiscovery.com/satellite-technology/heat-management-in-satellites-techniques-for-dissipating-heat-in-space

since radiating heat is the only real way of getting rid of heat, the main solutions are limited size and power combined with insulation. quite opposite to what datacenters do.

[–] rain_enjoyer@sopuli.xyz 47 points 2 days ago (1 children)

heat dissipation on satellites is a cataclysmic showstopper, but even if it was solved, anything on a satellite has to survive launch, is nonrepairable and all of that expensive silicon burns down in a couple of years

"datacenters in space" story is a result of highly advanced reasoning: 1. musk has space launch company 2. musk has ai ~~company~~ cash furnace 3. musk wants more money and 4. for what i assume are completely rational reasons and not speculation fueled by cultists, ai stocks pumped and only started crashing recently

[–] rain_enjoyer@sopuli.xyz 1 points 2 days ago

and before that, you're gonna take a real hard look on whether regular ai datacenters on ground are profitable (they're cash furnaces)

[–] aldhissla@piefed.world 30 points 2 days ago (2 children)

Nah, man. I have an issue with your wording. You have not been "hearing a lot of talk". You are quoting one specific lie of a prolific grifter.

Nobody in their right mind agrees with this. If you had put your question as "Elon Musk, owner of a satellite launching company, as well as several money burning pits, wants others to pay him to put some of those money burners into orbit. Is there any sense to this?", the answer would be trivial.

[–] JubJubBird@sh.itjust.works 3 points 1 day ago (1 children)

It has come up in talks with a friend of mine, I have read an independent article on it and I have also read Musk wants to do it. That is my experience with the topic. I think it's patronizing that you tell me how I should phrase my question.

[–] aldhissla@piefed.world -4 points 1 day ago (1 children)

Of course you would. But I also don't quite believe you. Everybody lies on the internet, and when I see corporate PR being regurgitated by someone pretending to be "just one of us", indignant when confronted, expecting the benefit of the doubt, I call it out.

Well just the other day I was doing my regular human activities with my biological friend Frobert, and just between consuming two Earth crustaceans, we came to talk about the benefits of alchemy to transmute people into gold. We've got the idea from Grok.

It doesn't matter to me whether you're an actual shill or someone genuinely uninformed whose talking points reflect whatever a shill would say. If you give me the Musk fan impression, I'm gonna give you the Musk fan treatment. Call me patronising if you want 🤷.

Yeah, you're being an ass.

[–] RodgeGrabTheCat@sh.itjust.works 2 points 1 day ago (5 children)

I found several companies planning on launching data centers into orbit.

Blue Origin, Orbital, Aetherflux, and Starcloud.

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[–] Folstar@lemmus.org 22 points 2 days ago (1 children)

Absolutely. Data centers on earth are subject to the laws of physics. Data centers in space, per SpaceX's white paper on the subject, operate beyond paltry thermodynamics, material sciences, and several other fields of science. When you're that much of an IPO boosting gigachadalphabro it's all profit.

[–] actionjbone@sh.itjust.works 23 points 2 days ago (1 children)

Everyone knows physics doesn't exist in outer space. If it did, there would be gravity.

[–] bstix@feddit.dk 10 points 2 days ago

Nobody can hear you lying in space.

[–] MonkderVierte@lemmy.zip 10 points 1 day ago

No, it's a stupid idea through and through.

[–] kerthale@lemmy.world 11 points 2 days ago (1 children)
  1. heat (dissipation)
  2. power
  3. network bandwidth
  4. cosmic rays (shielding)
  5. part failures (with so many parts, there’s always something broken
  6. eol parts (lifecycling in 3-5 yrs avg)

They are all challenges that can be overcome. But at what cost. Consensus is that economically it seems hilariously unviable. Datacenters tend to have to make their money back within about 3 years. The 3 year make money back issue is also why I believe the AI DC buildout is such a high risk gamble/bubble. In a year or two, all that hardware they made a year ago will need to be replaced. You just redo the whole investment again…

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

Yep. Data center in space is about as dumb as an underwater bakery.

[–] phoenixz@lemmy.ca 2 points 1 day ago

That actually isn't a bad analogy

You've been hearing the marketing hype of a Nazi space company CEO trying to prop up his company's stock price so he can unload his rotten shares.

[–] dreadbeef@lemmy.dbzer0.com 5 points 1 day ago

The amount of energy required to send a human up there for maintenance is, literally, astronomical. Can a datacenter run at a profit with zero humans? You tell me.

[–] ohulancutash@feddit.uk 13 points 2 days ago

They’re good for people selling rocket launches.

[–] swordgeek@lemmy.ca 11 points 2 days ago (1 children)

Fuck no. They're a stupid, terrible idea peddled by psychotic grifters.

[–] axh@lemmy.world 3 points 2 days ago

Even the "energy generation benefit" is dubious. The solar panels in space might be more efficient, but if you consider the cost of transportation, installation and maintenance... It won't add up. You could just build more panels on earth and get similar results (still much cheaper). It's not like we are running low on space on earth.

[–] agentTeiko@piefed.social 10 points 2 days ago (1 children)

Yeah its a pipe dream told by people that have not thought it through and people selling to investors by telling lies for investment dollars.

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[–] unitedwithme@lemmy.today 7 points 2 days ago* (last edited 2 days ago)

It would be astronomically expensive, wasteful, and expensive (yes twice).

Got a server rack damaged? Are the IT going up to fix it or astronauts? What kind of training would there need to be? What about upgrades? What about waste or recycling of old equipment? Do you just eject out into space wasting all the precious resources??

It's a completely stupid thought that they hoped sounded cool, but it's not really beneficial in any way

[–] raman_klogius@ani.social 6 points 2 days ago (3 children)

Methinks the reason techbros want to put compute in space is to have it physically away from people. Normal data centers are right there to be smashed and torched in the event of widespread societal unrest. In space, it's unreachable.

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

Yes because it's a bubble, none of them make real money so it's a waste to actually build them, but you have to fake it to scam investors. On earth the investors will look at land purchases and permits and power contracts and construction, so you have to spend millions of dollars to fake it. You can trade stock back and forth with Nvidia and "order" infinite chips that will never exist but you can't do that for electricians.

In space you just have to already own a vanity project rocket company. You fill out a form with the FCC and get a theoretical permit to launch "up to" 100 quadrillion datacenters into space, and then just point to a windowless factory that might theoretically have the capacity to make datacenter satellites but you can't let them see inside because you have classified defense contracts. Who knows might be a trillion dollars in shareholder value in there, you can't prove there isn't.

[–] Drusas@fedia.io 6 points 2 days ago

I, personally, would just really appreciate it if we could stop by blocking our view of the sky/solar system with so much future garbage.

[–] breezeblock@lemmy.ca 6 points 2 days ago (1 children)

No — makes absolutely no sense what so ever

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[–] fubarx@lemmy.world 5 points 2 days ago (2 children)

What they don't show in a lot of SciFi is the mundane day-to-day stuff (AFAIK, the only shows that came close were Red Dwarf and Firefly.)

Problem is, things break. Connectors come loose. Temperature makes things brittle. Small debris cross pads and create shorts. Most automated manufacturing lines can catch assembly problems, but none have 0% failure rate. This is what post-deployment maintenance is for. Somebody shows up in a van with a bunch of test gear and replacement parts. They diagnose the problem, swap out a cable or board, and the business keeps humming.

Add IoT and fancy telemetry. Monitor sensors and run ML to do predictive analytics. It still requires someone in a cargo van with a bunch of spare parts.

If you put an installation in a remote location, under water, or in space, there are benefits. But you just multiplied the cost of basic maintenance. You can build in redundancies, but a small glitch at a single-point-of-failure could cascade to a catastrophe.

Microsoft and Google tried putting data-centers under water, and after years of trials they nixed it because of these issues. Multiply that for something far out in space.

Only alternative is to build failure into the business model. Something breaks, you just leave it to rot (or burn in the atmosphere) and send another container out. Maybe the finance math works out, but it sure is wasteful.

tl:dr: SciFi is fantasy. A clogged toilet is reality.

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

Oh right. I already forgot about the underwater data centre hype. Data centre in space would face much of the same challenges so the concept has basically already been tried and failed.

[–] Septian@lemmy.zip 2 points 2 days ago

Don't disagree with your main point at all, just want to throw The Expanse into your list for shows that do a good job of showing things just break and it's catastrophic when they do it in space.

[–] qaz@lemmy.world 4 points 2 days ago* (last edited 2 days ago)

It's an idea used to justify merging xAI (burning through cash) and SpaceX (more profitable*). It's not remotely practical due to heat dissipation, general complexity, additional cost, and complete inability to service broken components.

[–] Kolanaki@pawb.social 4 points 2 days ago

Well, no, because generally things that don't work at all don't make money.

[–] breakfastmtn@lemmy.ca 4 points 2 days ago

It seemed to work for Arasaka so 🤷‍♂️

[–] marcos@lemmy.world 1 points 1 day ago

If you find somebody willing to pay some 1000 times more for a computer because it's rotating around the sky, then yes, it's profitable. Those "1000" are probably an understatement, but there exists some number that works.

There's probably a single-digit-billions market there.

For comparison, SpaceX's space business is a 2-digits-billions business, and they claim they have a 2-digits-trillion market to grow into.

[–] sem@piefed.blahaj.zone 3 points 2 days ago
[–] pwnicholson@lemmy.world 2 points 2 days ago* (last edited 2 days ago)

It's about being outside of any company's jurisdiction. Same thing for the floating datacenters at sea. Can't tax it and regulate it if it's not in any legal country.

[–] SuiXi3D@fedia.io 1 points 2 days ago

My understanding is that computers in space need to have redundancies in the hardware design because bit flips are a lot more common. Radiation and whatnot. Regardless, you can't just shove some parts in a case and expect it to work. At least not for very long.

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