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Propositions · 11 propositions · 37 records · 1989–2026

Arguments about compute in orbit

Which located texts, from 1989 to 2026, state, contest or bear on the reasons given for placing computing in orbit and on the limits and objections raised against it? For each proposition, which text is the earliest located?

Each argument is recorded as a proposition with one criterion. It is phrased generically and attributed to no one. A text that meets the criterion articulates the proposition. A text that disputes it contests it. A text that comes close bears on it, and its record names what is missing. Companies that propose orbital data centres also state limits of their own designs, and their records say that they come from a proponent. Texts are listed in date order. The page records what texts say and when. It does not assess whether an argument is right or whether any system was built.

A machine selected and arranged these records. No human review of the selection or framing is recorded.

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The original sources first, in date order, then every proposition on this page with its criterion, earliest located text and records. Each record gives its original source and the place in it, its role, register and dates, the qualification and the missing element of a context record, then the Selekoa identifiers. Stored paraphrases and permitted short quotes are included. Original documents are not.

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How to read a record
Articulates
A passage meets the proposition’s criterion.
Contests
A passage disputes the proposition or a premise it depends on.
Bears on
A passage comes close without meeting the criterion; the record names what is missing.
Earliest located
The earliest articulation the searches found, dated by its wording. It is not a claim that no earlier text exists.
Earliest located use of the name
The earliest located text that uses the proposition’s usual name. A title can carry the name without stating the proposition.
Conditions
The model assumptions or stated conditions under which a passage holds. A conditional result is not a forecast.
Estimate
An estimate as the text states it, with its holder, horizon and the text’s own definition. Estimates from different texts are not converted or combined.
Dates
The first date is the one the work is dated by. “Wording attested” gives the date from which the quoted wording is known, when it survives only in a later copy. “Claimed” gives an earlier talk, draft or presentation that does not date the wording.
Register: the kind of text
Fiction, satire, a dream frame or a relay of another author is labelled. A passage in fiction records what the work says, not its author’s view. Unlabelled records are nonfiction.
Limits of this page
  • “Earliest located” means the earliest text found by the searches described under “How we searched”. It is not a claim of first use.
  • A record documents what a text says. It is not evidence that the proposition is true, that a design works or that any system was built or launched.
  • Figures in arguments, such as launch prices or radiator areas, are each text’s own, under its own assumptions, and are not compared across texts.
  • Each record carries the date its work is dated by. Where the quoted wording is known only from a later copy, the date from which it is attested is shown.
  • The codes O1 to O11 correspond to OC1 to OC11 in the research pack the records come from.
  • A machine selected and classified these records, and machine checks from two model families re-examined them. No person has reviewed them.

R · Reasons given for orbital compute

Solar supply, radiative cooling, constraints on building on Earth, the launch-price condition and lifecycle emissions, as texts from 2024 to 2026 state them.

O1 Orbital solar supply as a reason for orbital compute

Criterion. Solar power in suitable orbits is more continuous or more abundant than on Earth, and this is given as a reason to place computing there.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) argues that data centres in orbit can use solar power around the clock, unhindered by night, weather and the atmosphere.2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  2. ArticulatesTravis Beals · Exploring a space-based, scalable AI infrastructure system designGoogle's Suncatcher post (November 2025) states that in the right orbit a solar panel can be up to eight times more productive than on Earth and produce power nearly continuously.2025-11-04 Inspect claim & evidence ↗Document page →
  3. ArticulatesSpaceX · xAI joins SpaceX to Accelerate Humanity’s FutureSpaceX's update of 2 February 2026 argues that satellites directly harnessing near-constant solar power will transform the ability to scale compute.2026-02-02 Inspect claim & evidence ↗Document page →

O2 Radiative cooling in orbit as an advantage

Criterion. Rejecting heat by radiation to space lets an orbital data centre avoid the water use, chillers or cooling energy of terrestrial data centres.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedThales Alenia Space · Thales Alenia Space reveals results of ASCEND feasibility study on space data centersThe ASCEND results release (June 2024) states that space data centres would not require water to cool them.2024-06-27 Inspect claim & evidence ↗Document page →
  2. ArticulatesEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) argues that orbital data centres can lower cooling costs by passive radiative cooling to space.2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  3. ContestsAndrew Cavalier · Why Thermodynamics Rules Future Orbital Data CentersCavalier's IEEE Spectrum article (June 2026) calls "free cooling" perhaps the biggest misconception about computing in space, because without an atmosphere only radiation can remove heat.2026-06-11 Inspect claim & evidence ↗Document page →

O3 Terrestrial constraints as a reason for orbital compute

Criterion. Constraints on building or powering data centres on Earth (land, permitting, grid connection, power supply, water or local impact) limit their growth, and placing compute in orbit is said to avoid them.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) argues that orbital data centres can be scaled almost indefinitely without the physical or permitting constraints faced on Earth.2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  2. ArticulatesAxiom Space · Axiom Space to Launch Orbital Data Center Nodes to Support National Security, Commercial, International CustomersAxiom Space's release (April 2025) states that limitations of terrestrial data centres, including energy, cooling, real estate, licensing and permitting, are becoming increasingly apparent, and presents its orbital nodes as mitigating them.2025-04-07 Inspect claim & evidence ↗Document page →
  3. ArticulatesSpaceX · xAI joins SpaceX to Accelerate Humanity’s FutureSpaceX's update of 2 February 2026 argues that global electricity demand for AI cannot be met with terrestrial solutions, even in the near term, without hardship on communities and the environment.2026-02-02 Inspect claim & evidence ↗Document page →

O4 Falling launch prices as a condition of orbital compute

Criterion. The economic viability of orbital compute depends on launch prices falling, stated with or without a price threshold per kilogram.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (2)

  1. Articulates · Earliest locatedEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) assumes a long-term launch price of about $30 per kilogram and argues that at such prices launch is no longer a primary cost driver.Estimate by stated in the text: about USD 30 per kg · horizon: as stated in the text · definition: launch price per kilogram · conditional · conditions: launch price per kilogram, stated expectation2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  2. ArticulatesBlaise Agüera y Arcas; Travis Beals; Maria Biggs; Jessica V. Bloom; Thomas Fischbacher; Konstantin Gromov; Urs Köster; Rishiraj Pravahan; James Manyika · Towards a future space-based, highly scalable AI infrastructure system designThe Suncatcher paper (November 2025) argues that if launch to LEO reaches $200 per kilogram, launch cost amortised over spacecraft life could be roughly comparable to terrestrial data-centre energy costs per kW.Estimate by stated in the text: up to USD 200 per kg · horizon: as stated in the text · definition: launch price per kilogram · conditional · conditions: launch price per kilogram to LEO, stated threshold2025-11-22 Inspect claim & evidence ↗Document page →

O5 Lower lifecycle emissions of orbital data centres

Criterion. Orbital data centres can have lower lifecycle greenhouse-gas emissions than terrestrial ones, with or without stated conditions (such as a less emissive launcher).

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedThales Alenia Space · Thales Alenia Space reveals results of ASCEND feasibility study on space data centersThe ASCEND results release (June 2024) states that, to significantly reduce the CO2 emissions of data processing and storage, space data centres would require a launcher ten times less emissive over its lifecycle.2024-06-27 Inspect claim & evidence ↗Document page →
  2. ArticulatesAngie Lee · How Starcloud Is Bringing Data Centers to Outer SpaceNVIDIA's post (October 2025) quotes Starcloud's chief executive Philip Johnston as saying that, apart from launch, orbital data centres would bring tenfold carbon-dioxide savings over their life compared with terrestrial power.2025-10-15 Inspect claim & evidence ↗Document page →
  3. ContestsAccademia Nazionale dei Lincei · Comment of the Accademia Nazionale dei Lincei on SpaceX’s Application for Orbital Data CentersThe Accademia dei Lincei's FCC comment (March 2026) argues that launching about a million tons a year, as SpaceX considers, would deposit a million tons of fuel a year in the stratosphere and mesosphere with significant environmental consequences.2026-03-03 Inspect claim & evidence ↗Document page →

L · Limits and objections

Heat rejection, radiation, repair, cost, links to the ground, and the sky, debris and the atmosphere. The earliest located text on radiation is a 1989 paper on spacecraft electronics, recorded because the criterion asks only about computing hardware in orbit.

O6 Heat rejection as a constraint on orbital compute

Criterion. Because heat in orbit can be rejected only by radiation, thermal management (for example the required radiator area) is a significant engineering or cost constraint on orbital compute.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedTravis Beals · Exploring a space-based, scalable AI infrastructure system designGoogle's Suncatcher post (November 2025) names thermal management among the significant engineering challenges that remain for space-based ML compute.2025-11-04 Inspect claim & evidence ↗Document page →
  2. ArticulatesSlava G. Turyshev · Orbital Data Centers: Spacecraft Constraints and Economic ViabilityTuryshev's preprint (April 2026) treats radiator area as part of its base-case mass model, with about 2,500 m2 of radiator for 1 MW of IT power, and concludes that general compute for terrestrial users closes only when several conditions hold together.2026-04-29 Inspect claim & evidence ↗Document page →
  3. ArticulatesAndrew Cavalier · Why Thermodynamics Rules Future Orbital Data CentersCavalier's IEEE Spectrum article (June 2026) calculates that a 40 kW AI rack would need an 80-square-metre radiator in orbit.2026-06-11 Inspect claim & evidence ↗Document page →
Texts that bear on it without meeting the criterion (1)
  1. Bears onEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) states that a gigawatt-scale orbital data centre would need radiators dissipating gigawatts of heat, by far the largest deployed in space, while estimating them at under half the solar-array size.Missing: a statement that heat rejection is a significant constraint: the paper presents the radiator requirement as manageable2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →

O7 Radiation effects on computing hardware in orbit

Criterion. Ionizing radiation in orbit degrades or disrupts computing hardware, requiring shielding, redundancy, error correction or hardened parts.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedW. A. Kolasinski · Effects of space radiation on electronic microcircuitsKolasinski’s paper on the effects of space radiation on electronic microcircuits (NASA/SDIO workshop proceedings, May 1989) states that single-event upsets appear in computer memories as unexplained bit flips, reports upset rates observed in memories in orbit, and describes efforts to harden payload designs and develop devices resistant to single-event effects.1989-05 Inspect claim & evidence ↗Document page →
  2. ArticulatesEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) states that shielding is required against radiation-induced latch-up, transients and total-dose effects in sensitive components, while arguing that shielding mass per unit of compute falls with container size.2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  3. ArticulatesAndrew Cavalier · Why Thermodynamics Rules Future Orbital Data CentersCavalier's IEEE Spectrum article (June 2026) argues that commercial AI chips are "soft" targets for high-energy particles in orbit, which can flip memory bits or cause latch-ups.2026-06-11 Inspect claim & evidence ↗Document page →
Texts that bear on it without meeting the criterion (1)
  1. Bears onBlaise Agüera y Arcas; Travis Beals; Maria Biggs; Jessica V. Bloom; Thomas Fischbacher; Konstantin Gromov; Urs Köster; Rishiraj Pravahan; James Manyika · Towards a future space-based, highly scalable AI infrastructure system designThe Suncatcher paper (November 2025) reports proton-beam tests in which Trillium TPU HBM showed irregularities after 2 krad(Si), about three times the authors' five-year requirement of 750 rad(Si).Missing: a statement that orbital radiation requires mitigation: it reports a ground test with a margin over the authors’ requirement2025-11-22 Inspect claim & evidence ↗Document page →

Headlines replaced

  • The Lumen Orbit white paper (September 2024), headlined as earliest located by the research pack of 2026-10-28. Earlier text found by the cross-family check: Kolasinski’s paper on space radiation and electronic microcircuits (May 1989) meets the criterion as worded. Recorded 2026-10-30.

O8 No practical repair of hardware in orbit

Criterion. Failed hardware in orbit cannot practically be repaired or replaced by technicians as on Earth, so failures must be met by redundancy, module replacement or launches.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (3)

  1. Articulates · Earliest locatedEuropean Space Policy Institute (ESPI) · Data Centres in Space: Orbital Backbone of the Second Digital Era? (ESPI Report 98)ESPI Report 98 (November 2025) states that in-orbit servicing remains so costly that deorbiting a failed satellite and launching a replacement is generally considered more cost-effective than sending crews for repairs, and that the maintenance cycle of a space-based data centre is expected to depend heavily on redundancy, which itself increases costs.2025-11-19 Inspect claim & evidence ↗Document page →
  2. ArticulatesBlaise Agüera y Arcas; Travis Beals; Maria Biggs; Jessica V. Bloom; Thomas Fischbacher; Konstantin Gromov; Urs Köster; Rishiraj Pravahan; James Manyika · Towards a future space-based, highly scalable AI infrastructure system designThe Suncatcher paper (November 2025) states that replacing failed TPUs by technicians, simple on Earth, is impracticable in space, and that redundant provisioning is the simplest solution.2025-11-22 Inspect claim & evidence ↗Document page →
  3. ContestsSpaceX · xAI joins SpaceX to Accelerate Humanity’s FutureSpaceX's update of 2 February 2026 describes its orbital compute satellites as having no ongoing operational or maintenance needs.2026-02-02 Inspect claim & evidence ↗Document page →
Texts that bear on it without meeting the criterion (1)
  1. Bears onEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) states that its design lets compute containers and other modules be swapped out to replace old or faulty equipment.Missing: a statement that repair in orbit is impracticable: it describes a design with swappable modules2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →

Headlines replaced

  • The Suncatcher paper (22 November 2025), headlined as earliest located by the research pack of 2026-10-28. Earlier text found by the cross-family check: ESPI Report 98, published on 19 November 2025. Recorded 2026-10-30.

O9 Orbital compute costs more than compute on Earth

Criterion. At current or assumed launch and spacecraft prices, computing in orbit costs more than equivalent computing on Earth.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (4)

  1. Articulates · Earliest locatedEuropean Space Policy Institute (ESPI) · Data Centres in Space: Orbital Backbone of the Second Digital Era? (ESPI Report 98)ESPI Report 98 (November 2025) models gigawatt-scale space-based data centres against a terrestrial benchmark and finds that, under its modelling assumptions, a constellation architecture has double the benchmark’s capital cost and more than triple its operating cost, and a monolithic architecture an operating cost 38% higher.Conditions: The report’s cost model of gigawatt-scale architectures, with a two-year IT-hardware lifetime; its cost equations give expected values without a measure of uncertainty.2025-11-19 Inspect claim & evidence ↗Document page →
  2. ContestsSpaceX · xAI joins SpaceX to Accelerate Humanity’s FutureSpaceX's update of 2 February 2026 gives its author's estimate that within two to three years the lowest-cost way to generate AI compute will be in space.2026-02-02 Inspect claim & evidence ↗Document page →
  3. ArticulatesSlava G. Turyshev · Orbital Data Centers: Spacecraft Constraints and Economic ViabilityTuryshev's preprint (April 2026) finds that matching a terrestrial benchmark of 10-40 thousand dollars per kW allows only 250-1,000 $/kg for launch plus build, 3.4-13.5 times below the current public Falcon 9 dedicated launch price alone.2026-04-29 Inspect claim & evidence ↗Document page →
  4. ArticulatesAndrew Cavalier · Why Thermodynamics Rules Future Orbital Data CentersCavalier's IEEE Spectrum article (June 2026) reports an ABI Research estimate that launching and running a GPU in space for a year costs at least an order of magnitude more than on Earth, even assuming $44/kg Starship launch.2026-06-11 Inspect claim & evidence ↗Document page →

Headlines replaced

  • Turyshev’s preprint (April 2026), headlined as earliest located by the research pack of 2026-10-28. Earlier text found by the cross-family check: ESPI Report 98 (November 2025), whose cost model is specific to the architectures it models. Recorded 2026-10-30.

O10 Ground links as a limit on orbital compute

Criterion. Links between orbital compute and users or data on the ground (bandwidth, latency, ground stations) limit which workloads orbital compute can serve.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (2)

  1. Articulates · Earliest locatedTravis Beals · Exploring a space-based, scalable AI infrastructure system designGoogle's Suncatcher post (November 2025) names high-bandwidth ground communications among the significant engineering challenges that remain.2025-11-04 Inspect claim & evidence ↗Document page →
  2. ArticulatesSlava G. Turyshev · Orbital Data Centers: Spacecraft Constraints and Economic ViabilityTuryshev's preprint (April 2026) concludes that general compute for terrestrial users closes only for low Earth-coupled communication intensity, high utilisation, long lifetime and very low launch-plus-build cost.2026-04-29 Inspect claim & evidence ↗Document page →

O11 Harm to the sky and debris risk from orbital data centres

Criterion. Large orbital-data-centre constellations would harm astronomical observation or the night sky, or raise collision, debris or atmospheric risks.

Filled dots articulate, open dots contest, small dots bear on the proposition; a large dot is an earliest located text. A line below a dot runs to the date from which its wording is attested.

Texts that articulate or contest it (4)

  1. ContestsEzra Feilden; Adi Oltean; Philip Johnston · Why we should train AI in spaceThe Lumen Orbit white paper (September 2024) argues that, if best practices are followed, terrestrial astronomy is unlikely to be affected by orbital data centres in its chosen dawn-dusk orbit, while naming debris mitigation as a key hurdle.2024-09 · wording attested 2024-12-24 Inspect claim & evidence ↗Document page →
  2. Articulates · Earliest locatedAblimit Aili; Jihwan Choi; Yew Soon Ong; Yonggang Wen · The development of carbon-neutral data centres in spaceAili, Choi, Ong and Wen’s Perspective on carbon-neutral data centres in space (Nature Electronics, 2025) states that retired orbital hardware ends up as space junk that could burn up in the atmosphere, releasing emissions and other harmful chemicals, a disadvantage compared with terrestrial data centres.2025-10-27 · wording attested 2025-11-25 Inspect claim & evidence ↗Document page →
  3. ArticulatesAccademia Nazionale dei Lincei · Comment of the Accademia Nazionale dei Lincei on SpaceX’s Application for Orbital Data CentersThe Accademia dei Lincei's FCC comment (March 2026) expresses grave concern about SpaceX's proposed orbital data centres, arguing that they would very negatively affect ground-based optical astronomy and raise collision and debris risks.2026-03-03 Inspect claim & evidence ↗Document page →
  4. ArticulatesGeoffrey W. Marcy · The Impact of Computing Data Centres Orbiting EarthMarcy's preprint (March 2026) argues that kilometre-scale orbital computing arrays would alter the night and daytime sky and increase the likelihood of collisions that could trigger runaway debris production.2026-03-29 Inspect claim & evidence ↗Document page →
Texts that bear on it without meeting the criterion (1)
  1. Bears onSecure World Foundation · SWF publishes three FCC filings addressing recent applications for orbital data centersSecure World Foundation stated (May 2026) that orbital data-centre applications by SpaceX, Starcloud and Blue Origin should not be treated as routine licensing matters and asked the FCC to require system-level analysis of cumulative collision risks.Missing: a statement that the constellations would raise collision or debris risks: it asks the regulator for system-level analysis of them2026-05-17 Inspect claim & evidence ↗Document page →

Headlines replaced

  • The Accademia dei Lincei’s comment to the FCC (March 2026), headlined as earliest located by the research pack of 2026-10-28. Earlier text found by the cross-family check: a Perspective on carbon-neutral data centres in space, whose wording an Internet Archive capture attests from 25 November 2025. Recorded 2026-10-30.