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root-parent 6 hours ago

Data Centers in Space are a practical engineering impossibility, as well as making no economic sense. Engineering and the laws of physics get on the way.

Just because Scott Manley refuses to call that out, so he can do another eight videos about it, don´t stop listening to somebody with the feet on the ground:

"Orbital Data Centers: Spacecraft Constraints and Economic Viability" - https://arxiv.org/abs/2604.27197

"Hot AI in Cold Space: Thermal-Crosstalk-Aware Scheduling for Sustainable Orbital AI Clusters" - https://arxiv.org/abs/2606.26150

"Above the Cloud: Building Data Centers in Space - Richard Campbell - NDC Copenhagen 2026" - https://youtu.be/eo7MEPgWGic

"Space Data Centers Are Dumb" - https://youtu.be/-w6G7VEwNq0

ryandvm an hour ago | parent | next [-]

Nobody in this industry with a modicum of applicable expertise believes that orbital data centers make sense financially. Like colonizing Mars and most of Elon's pipe dreams, it's not the stated goal they believe in, it's getting fabulously wealthy from fat government contracts along the way.

Once you understand this about Musk, you realize that everything he is involved with works that way.

hackeraccount 4 minutes ago | parent [-]

How does this get them a government contract?

nancyminusone 2 hours ago | parent | prev | next [-]

I don't think they are impossible, just impractically expensive. That should be no problem for AI companies and their infinite access to capital. Nobody wants datacenters to be built around here on the ground, so I say get to spending.

If it ends up bankrupting them, even better.

Reddit_MLP2 2 hours ago | parent [-]

the way the crony capitalism economy works, it will bankrupt all of us well before it does the AI companies...

aeternum 2 hours ago | parent | prev | next [-]

Good thing Elon's companies have a history of moving engineering impossibilities from impossible to slightly late.

Remember when globally competitive electric cars, re-usable boosters, catching a rocket with chopsticks, playing a fps game via a brain implant, and maintaining a satellite constellation at 480km LEO were also impossible?

CuriouslyC 2 hours ago | parent | next [-]

There's a difference between "infeasible given materials and manufacturing capabilities of the time" and "infeasible as a scalable solution due to the laws of physics"

29 minutes ago | parent | next [-]
[deleted]
rbanffy 2 hours ago | parent | prev | next [-]

There is also the very practical question of "what problem is this trying to solve?"

xnx 5 minutes ago | parent [-]

To which the answer for SpaceXaiTesla is always: Hype up gullible investors about the glorious future just around the corner.

aeternum 2 hours ago | parent | prev [-]

What law of physics do orbital data centers violate? You must have learned some strange physics.

grim_io an hour ago | parent | next [-]

How about the physics of space radiation and radiative cooling.

The guy has to rent out his terrestrial data centers because he can't make use of them.

We probably don't need to pollute space with dead GPU's.

CuriouslyC an hour ago | parent | prev | next [-]

note the scalable in there. Even under best case assumptions, it's only a good fit for edge coprocessing where latency is super important. You're not going to power the world's compute with a self healing Dyson sphere (but if you think that, I've got something to sell you).

dreamcompiler an hour ago | parent | prev [-]

Thermodynamics.

automatic6131 2 hours ago | parent | prev | next [-]

Almost no one said those were impossible, just hard. This is completely different. Rather like... a train in a vacuum tube hard. Definitely harder than making a subway with autonomous trains under a modern city. And much harder than being a third rate AI lab, though Elon did hit that target perfectly.

chuckadams 2 hours ago | parent [-]

Train-in-a-vacuum-tube isn't even restricted by the laws of physics, and it doesn't have to be a perfect vacuum anyway, just low pressure. Data Centers IN SPAAAAAACE have the teensy little problem of cooling that you can't just brute-force a solution to. Those giant things dangling off the ISS that make up most of its footprint aren't solar panels, they're heatsinks, and they still have issues managing heat.

rbanffy 2 hours ago | parent | next [-]

Well... If the launch cost is low enough you can just pack a radiator large enough. Good thing this might drive the development of a wider Starship and Ultraheavy booster (or a Superheavy-Heavy where three Superheavy rockets boost a bigger, heavier Starship). Eventually we can get to the Comicallyheavy booster.

chuckadams 2 hours ago | parent [-]

Perhaps, but I don't see the costs getting anywhere near being worth it. You'd need a space elevator or to manufacture the sinks IN SPAA— er, in space. The latter is theoretically possible but still extremely remote, the former still requires unobtanium.

rbanffy an hour ago | parent [-]

It all depends on how far you are willing to go to make your server invulnerable to a police raid.

throw310822 43 minutes ago | parent [-]

The police will just arrest you and/ or anyone who operates the downlinks or connects to you. The server can stay in space.

aeternum an hour ago | parent | prev [-]

Energy radiation scales T^4 so physics is really on your side here. If you can engineer GPUs to run a little hotter you get significant decreases in radiator size required.

adrian_b 23 minutes ago | parent [-]

That will have to wait 10 years, or even a few more years, for a transition from silicon to a semiconductor with a wider bandgap.

rose-knuckle17 2 hours ago | parent | prev | next [-]

Is the starlink constellation profitable on its on without any cross subsidization from any other Musk endeavor?

From the SpaceX S-1: "For launches of our Starlink satellites, the Company does not recognize any inter-segment revenue, rather those launch costs are capitalized in satellites in Property, plant, and equipment, net." In plain terms: SpaceX's rocket division charges outside customers roughly $102 million per Falcon 9 launch — but it charges Starlink $0.

SpaceX appears to be heavily subsidizing Starlink in the launch cost sense.

There is a mix of clever and sketchy accounting going on in Muskworld making it hard to see which elements profitable/sustainable and what isn't.

Mountain_Skies 42 minutes ago | parent | next [-]

It would be interesting to see how much of Starlink's business is due to global conflicts, especially the one in Ukraine. If peace should break out, how does that impact Starlink's bottom line? I have strong doubts that rural villagers in the Amazon are a high profit customer base. In my area everyone was clamoring for Starlink to rescue us from DSL. Then fiber came and everyone lost interest in Starlink.

boxed 2 hours ago | parent | prev [-]

> Is the starlink constellation profitable on its on without any cross subsidization from any other Musk endeavor?

This is always a funny "gotcha" people bring up. Except the gotcha is always different somehow. Sometimes it's "the US subsidizes it" because NASA gets amazing deals on launches it would otherwise pay 10x or more for. Sometimes it's Starlink that subsidizes the launches. Sometimes it's the launches that subsidizes Starlink.

Maybe the answer is just what is obvious: vertical integration and economies of scale makes starlink/falcon 9 profitable. The combination is the thing.

rbanffy 2 hours ago | parent | prev | next [-]

This is not about something being impossible, but something that solves no problem except keeping launchers busy.

The only reason I can imagine for space-based data storage is being out of reach of most police investigators. Recently, a very corrupt banker in Brazil was arrested and his phones were confiscated and, up to now, two have been cracked, with a big effect on the approaching election. If the thing is in orbit, it's a lot harder to confiscate it.

toss1 an hour ago | parent | prev | next [-]

I used to make similar arguments.

But I also now look at actual results, and they are not merely late, they are far less than promised.

Globally competitive EV? Not against the Chinese competitors (Hint: it's why he plans to merge Tesla into SpaceX). Self-driving so good cars would be assets you could run your own self-driving Uber-like service (and customers paid a $10K upcharge for the ticket to do it next year)? NOPE, Tesla can't even do their own self-driving reliably. And whatever happened to the Tesla solar roofs? Can't get one.

Making a car company profitable enough to justify the insane multiples? NOPE, will never happen. But he's selling Tesla now on the Humanoid Robot "vision".

SpaceX did better on self-landing boosters, but they still have serious issues with scaling it up, and competitors are catching up.

But the physics of orbiting data centers make them not absolutely impossible, but very uneconomical. Every problem supposedly solved in space is easier and orders of magnitude cheaper to solve on the ground.

If you haven't yet noticed the pattern, Elon is always selling the next big hype wave. It is always the NEXT thing that will justify the insane multiples. If you want to buy and hype meme stocks on the next-greater-fool theory, good luck; you will do well for a while as there are many fools around.

dreamcompiler an hour ago | parent | prev [-]

Elon hires great engineers. Or at least he did before he blew out his brain with ketamine and went full-on fascist because he had a trans daughter.

He still hasn't built a fully self-driving car. His last electric vehicle (the only one he directly designed) was a massive flop. The successful Tesla vehicles are losing market share because they're old and because of the CEO's odious politics and because he seems to have lost interest in EVs unless they're robotaxis.

Just recently he scammed Wall Street with a horrific overvaluation for a company whose only profits come from Starlink and whose biggest rockets blow up before they reach orbit.

Now he's talking about orbital data centers which make no sense to any engineer who understands thermodynamics (and sadly, many don't) and which are unnecessary because within the next 5 years 90% of inference will be done on local machines in users' homes because the hardware and the algorithms will be good enough to enable it and every Joe and Jane are fed up with surveillance capitalism.

Mountain_Skies 39 minutes ago | parent [-]

On the plus side, there's enough surplus Tesla equipment that a boutique vehicle factory in Detroit is planning on using some of their cast off engine hubs to produce Kei style truck kits.

vonneumannstan 2 hours ago | parent | prev [-]

>Data Centers in Space are a practical engineering impossibility,

Not really, thermal radiators are well understood and the size needed aren't really that unreasonable. Radiation hardening the GPUs is probably the single hardest problem along with actual launch costs.

>making no economic sense

Yes this is the real issue, Spacex would need to reduce the cost of launches by ~10x with Starship for it to ever be viable.