Co-founder & CTO of Starcloud - building datacenters in space

Joined January 2017
20 Photos and videos
Without space datacenters we're on track for a Grey Goo type doomsday scenario, where every square meter of earth's surface gets tiled by solar datacenters. Once AI is unconstrained to expand out into space, it makes no sense to eat up earth - we're safe.
Plots of empty desert could soon be worth more than the most fertile farmland in human history. @CJHandmer ran through the back-of-the-envelope math. 10 acres of solar is enough for 1 MW of H100s. And the FLOPS done by those H100s is roughly equivalent to 1000 human brains. If we build models that match human performance per FLOP, we could produce 100 humans' worth of cognition per acre of solar. And that's just the floor. Today's chips are far less energy-efficient than the brain, so the actual number could be bigger still by >50x. The implied land value is insane. The clear incentive would be to use up almost all the world's land for solar.
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Ezra Feilden reposted
This is the real AI doom scenario and, IMO, the only way to avoid it is to make space AI economically preferable.
Plots of empty desert could soon be worth more than the most fertile farmland in human history. @CJHandmer ran through the back-of-the-envelope math. 10 acres of solar is enough for 1 MW of H100s. And the FLOPS done by those H100s is roughly equivalent to 1000 human brains. If we build models that match human performance per FLOP, we could produce 100 humans' worth of cognition per acre of solar. And that's just the floor. Today's chips are far less energy-efficient than the brain, so the actual number could be bigger still by >50x. The implied land value is insane. The clear incentive would be to use up almost all the world's land for solar.
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I will never get tired of presenting in front of this video
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Ezra Feilden reposted
The first time I posted this was September 2024… I didn’t think it would still be relevant now 🤦‍♂️🙄
You know the reason your Stanley or Hydroflask is so good at keeping your water cold is because there's a vacuum inside the walls of the thermos. Heat can't conduct in a vaccum. And "radiated" heat is ineffective at the temperatures processors operate at. This satellite will be like plugging in your gaming PC without a CPU cooler. It'll be dead in minutes.
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Or more than two, most likely.
many such cases
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Great to see the SpaceX AI space datacenter taking shape. I expect these will grow significantly in their next iterations - there are a lot of advantages to squeeze as much compute into one satellite as possible.
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Ezra Feilden reposted
Thanks so much Dave Limp and @BlueOrigin for hosting us! 🙏🙏 @davill, @Starcloud_, @Adi, @ezrafeilden
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What a turnaround Semianalysis x.com/SemiAnalysis_/status/1…
To Boldly Go: The Case for Space Datacenters Space DC Total Cost of Ownership Explained. Unpacking constraints from Terrestrial DCs and Chip Production. Space-Earth Parity in the late 2030s, Space DCs could start to be viable even sooner. newsletter.semianalysis.com/…
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Ezra Feilden reposted
Remarkable collaboration between SpaceX and Starcloud! Truly excited about the future of data centers in space.
I’m super excited to share that we have signed a contract with @SpaceX @Starlink to integrate its mini laser terminals onto our satellites for high bandwidth, low latency connectivity!
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Ezra Feilden reposted
Starcloud orders Starlink lasers for orbital data center network spacenews.com/starcloud-orde…
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Ezra Feilden reposted
I’m super excited to share that we have signed a contract with @SpaceX @Starlink to integrate its mini laser terminals onto our satellites for high bandwidth, low latency connectivity!
Starcloud is excited to announce that we will integrate 50 @SpaceX @Starlink Mini Laser terminals across 25 satellites.  Each of the @Starcloud_ satellites will carry two Starlink Mini Laser terminals, and the first hardware is expected on orbit within one year. Starlink Mini Laser terminals, the same laser crosslink technology that SpaceX developed for its Starlink constellation, provide up to 25 Gbps of continuous intersatellite connectivity at distances up to 4,000 km and are capable of higher link speeds at shorter distances. The terminals enable direct optical links between Starcloud satellites and the Starlink constellation using laser light, eliminating the need for Starcloud to send data directly through bandwidth-constrained ground stations.
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Plaser is awesome. It virtually eliminates the need for us to think about ground stations and data backhaul, and focus on our core technologies - power and cooling.
Starcloud is excited to announce that we will integrate 50 @SpaceX @Starlink Mini Laser terminals across 25 satellites.  Each of the @Starcloud_ satellites will carry two Starlink Mini Laser terminals, and the first hardware is expected on orbit within one year. Starlink Mini Laser terminals, the same laser crosslink technology that SpaceX developed for its Starlink constellation, provide up to 25 Gbps of continuous intersatellite connectivity at distances up to 4,000 km and are capable of higher link speeds at shorter distances. The terminals enable direct optical links between Starcloud satellites and the Starlink constellation using laser light, eliminating the need for Starcloud to send data directly through bandwidth-constrained ground stations.
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Much of the space industry is rightfully excited about deploying space datacenters from the pez dispenser. It's very achievable to deploy GB200 NVL72 rack scale compute within each pez, possibly pushing up to Rubin 600 kW racks at a stretch. But we need more than this. The largest models in the future may not even fit on a single 600 kW rack. At 5 - 10 MW scale out you can spread very thin a satellite's fixed costs, such as expensive optical terminals. Plus there are some big advantages of colocating more chips together for inference (more efficient batching, ability to accommodate dedicated specialised racks for prefill). When a larger payload door is available on Starship, we will be there.
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Starcloud-1 cameo on the Flight-12 webcast. Love this spacecraft. Still going strong, H100 humming. Currently orbiting above central asia.
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Confirmed SpaceX is planning active cooling (ie pumped fluid loops) for their AI satellites. When you consider the power density of today's bleeding edge processors, and the distance the heat needs to be moved, liquid cooling is the obvious choice. Starcloud-2 will be demonstrate this in a few months.
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There's a huge risk to orbital datacenters which I'm surprised I haven't seen discussed anywhere. All SSO datacenter operators need to align their orbital direction: strictly prograde (dusk-dawn) or strictly retrograde (dawn-dusk). If even a small number of players decide differently from the rest then head-on collisions are essentially guaranteed. A single collision would release 40 tons of TNT, quickly turning this very special orbit into a debris field. The good news is - the solution is very simple. There are few benefits of mixing dawn-dusk with dusk-dawn. Everyone just needs to choose dawn-dusk. Starcloud is working hard to make this happen. DM me if you are a dawn-dusk SSO user and would like to help.
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Ezra Feilden reposted
I called it 4 days ago! 🚀
If it’s really true that @AnthropicAI’s revenue went grew from $30bn last month to $40bn this month, then I don’t know why more people are freaking out about it. This is UN-BE-LIEV-A-BLE 😲🤯 You don’t have to extrapolate this out too far to get to Dyson Spheres! @Starcloud_
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This is unreal. Incredible.
Stunning first-sat views from @Starlink launch G10-38 on May 1, deployed from @SpaceX's Falcon rocket. Watch as the Starlink sats cruise over an entire orbit, through sunrise and sunset, and slowly separate from each as they complete their post-launch deployment sequence before beginning orbit raise.  The satellites are stacked like a deck of cards in the rocket, which slowly spins when dispensing to impart a small velocity difference, ensuring deconfliction.   May the @Starlink be with you.
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The answer becomes clearer by the day.
In solidarity with the IRGC, Seattle bombs itself back to the Stone Age. council.seattle.gov/2026/04/…
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Ezra Feilden reposted
.@Starcloud_ is bringing AI compute to orbit—cutting energy costs and enabling real-time insights from space.
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