Could you link to those serious analyses? The ones I've seen don't portray it as a total impossibility? Scott Manley did a runthrough that seemed reasonably positive on the possibility.

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runako 3 hours ago | parent | next [-]

Could you build a data center in space? Yes, absolutely I am sure there are no physical barriers. We have computers in space now, and those computers have telecom links to Earth.

Without even going into the numbers, terrestrial data centers have significant cost advantages. They don't have to spend $$$$$$$ to get to orbit. They can upgrade and/or fix components easily (likely safe to assume a hypothetical orbital DC would plan to never replace anything). They don't have to pay for the full capex of their power generation facilities. Lower-latency Internet. Heat dissipation is a (possibly unsolved?) problem. For every input cost to a data center, moving it to orbit massively increases that cost.

From a pure engineering standpoint: orbital data centers are not optimized to solve any common problem faced by data center operators or users. Permitting can get difficult in parts of the US, but at least permitting is a solved problem.

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sakagami0 2 hours ago | parent | next [-]

If you think launching a rack costs 100k, I think you need to continue your napkin math or youre not being true to yourself.

A GB300 costs about 70k, a rack is 72 of them.

The cost to launch is less than 2% overhead. Its is extremely feasible.

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ericd 3 hours ago | parent | prev [-]

I think you're understating the permitting problem - it's a major reason for the very large/rapid price hikes on power in the PJM region, and the populist backlash against data center construction, including moratoriums on DC construction. The difficulty in getting new electrical generation interconnected in many parts of the US is one of the major marks in favor of the plan.

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runako 2 hours ago | parent [-]

I'm not understating it. But I'm not buying the line that suddenly it's impossible to build industrial buildings in the US. I am realizing that there are thousands of jurisdictions in the US with wildly different permitting regimes, and then hundreds of other countries in the world that might be more welcoming.

But let's say they need to stay in the US. Are DC operators offering to buy down utility capex costs so that existing residents don't see a spike in rates? If not, obviously that is going to create opposition as nobody wants their utility bills to rise rapidly. It would probably be cheaper & easier to e.g. write a check to Southern Company to prevent rate hikes directly tied to their DC than to put a DC in space.

The math also barely pencils? IF Starship hits its $100/kg, getting a single rack of servers to orbit will cost ~$100k. A 500MW data center might have ~5k racks, so ~$500m to orbit. SpaceX estimates $100/kg - $300/kg so it could be $1.5B - $2B just to put the racks in orbit, plus the cost of the servers, plus the cost of the actual orbital data center itself, plus the cost of getting the orbital data center to orbit. That's getting into the "hand every resident a check for $100k in exchange for their county approving the permit" territory.

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ericd an hour ago | parent [-]

One Vera Rubin rack costs $3-7M and eats something like 600 kw, so you’re probably looking at more like 800 racks for that 500 MW DC. $100k launch costs per rack doesn’t seem too terrible if that’s what it works out to. I’m sure there’s a mountain of solar panels that aren’t included, though?

And it’s not that simple, building out power generation is very constrained, the interconnection queue is years long in many places, and the current backlog for new natural gas turbines is multiple years right now. Fixing the permitting isn’t impossible with some political will, but energy permitting reform is something that’s been bandied around for years in Congress and hasn’t made it across the finish line. EPRA almost made it at the end of last Congress but that session ended before it did. Hopefully it makes it this time, everyone should contact their congresspeople and ask them to support energy permitting reform.

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pilgrim0 3 hours ago | parent | prev [-]

Try this one. You need to parse the hard data from all the speculation. So draw your own conclusions.

https://www.aravolta.com/blog/datacenters-in-space

As it stands, most if not all institutional and journalistic research around this topic I would consider compromised because they’re in some way or another financially interested in this becoming the next big thing. Aravolta included. That’s why most articles will counter each hard constraint with a handful of hopeful speculations.

As for pure scientific analysis, like the Scott Manley one, they tend to entertain themselves too much with the physics and mathematics and forget the economics behind it all.

Take Google’s own paper (https://arxiv.org/pdf/2511.19468) that estimates that launch costs, just to roughly match data center energy costs on earth, would need to reach 200USD/kg, which requires a 10 fold cost reduction relative to the current launch costs of Falcon 9. And that is to launch a _disposable_ server into orbit, that will disintegrate after a few years and likely have hardware failures well before that.

And these servers are not anything like a “data center”, and they won’t run the applications that we are already scrambling to find demand in earth. No, these would theoretically run some ultra-niche, highly experimental workloads maybe for NASA or the military. That alone can’t possibly justify the investment, at least not for the retail investor that actually expects a positive ROI. Nevertheless the tech elite and their pet journalists are more than happy to sell this fantasy to the average people.

Hell, I’m still waiting for Project Natick to materialize, Microsoft’s data center on the ocean, which makes far, far more sense than data centers on frigging space. Still they didn’t manage to make that one work in any meaningful sense.

	▲	ericd an hour ago \| parent [-]
		Thanks, I took a look, couple things - the inlet temp on the VR is 45 C, but that’s not the radiator operating temp, you can probably run those chips closer to 90-100 C. And they’re building custom silicon for this, presumably that’ll be one of their design targets. Also, most bit flips should be fine when you’re running inference, you’re presumably running with some randomness anyway. If a node fails/becomes too unreliable, it can be detected and shut off. Idk, building in the ocean seems a lot harder to me than space. Salt water is ridiculously corrosive, extreme pressure, etc. And one of the main justifications for this is massively increasing the output of solar and making it consistently output its nameplate capacity, which space is great for, and ocean is terrible for. The only benefit for that one I can see is some power savings on cooling, and a whole boatload of drawbacks, whereas we might not be able to keep up with demand with terrestrial power. So I can totally see why they never bothered to complete their subsea datacenter. They’re definitely not aiming to put niche applications up, they want to run models by the bucketful. I don’t see how the economics make it impossible? To be clear, I’m not saying that it’s something that’s going to end up happening, I have no idea if it will, but I don’t see how it’s structurally impossible, and I can see some things to commend it if token usage volumes grow like I think they will.