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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.","Google'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.","SpaceX's update of 2 February 2026 argues that satellites directly harnessing near-constant solar power will transform the ability to scale compute.","The ASCEND results release (June 2024) states that space data centres would not require water to cool them.","The Lumen Orbit white paper (September 2024) argues that orbital data centres can lower cooling costs by passive radiative cooling to space.","Cavalier'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.","The 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.","Axiom 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.","SpaceX'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.","The 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.","The 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.","The 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.","NVIDIA'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.","The 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.","The Lumen Orbit white paper (September 2024) states that, because conduction and convection are not available in space, 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.","Google's Suncatcher post (November 2025) names thermal management among the significant engineering challenges that remain for space-based ML compute.","Turyshev'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.","Cavalier's IEEE Spectrum article (June 2026) calculates that a 40 kW AI rack would need an 80-square-metre radiator in orbit.","The 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.","The 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).","Cavalier'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.","The 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.","The 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.","SpaceX's update of 2 February 2026 describes its orbital compute satellites as having no ongoing operational or maintenance needs.","SpaceX'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.","Turyshev'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.","Cavalier'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.","Google's Suncatcher post (November 2025) names high-bandwidth ground communications among the significant engineering challenges that remain.","Turyshev'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.","The 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.","The 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.","Marcy'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.","Secure 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.","Kolasinski’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.","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.","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.","Aili, 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.","The Lumen Orbit white paper (September 2024) names on-orbit safety and orbital-debris mitigation as a key hurdle for orbital data centres, and says that their larger physical size makes them answerable for keeping the probability of collisions low.","The abstract of Periola and Kolawole’s article on space-based data centres (2019) states that relying on further terrestrial data centres becomes problematic in densely populated regions, which leads to exploring space as a place to host them."],"time":[{"kind":"event","date":"2024-09","basis":"publication","note":"Date of publication, as the source gives it."},{"kind":"event","date":"2025-11-04","basis":"publication","note":"Date of publication, as the source gives it."},{"kind":"event","date":"2026-02-02","basis":"publication","note":"Date of publication, as the source gives it."},{"kind":"event","date":"2024-06-27","basis":"publication","note":"Date of publication, as the source gives it."},{"kind":"event","date":"2024-09","basis":"publication","note":"Date of publication, as the source gives 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The proof read here prints “Received: 21 November 2023” and “Accepted: 7 August 2025”."},{"kind":"event","date":"2024-09","basis":"publication","note":"Date of publication, as the source gives it."},{"kind":"event","date":"2019-03-11","basis":"publication","note":"Online publication of the version of record, as the publisher and Crossref give it; the print issue is July 2019."}],"resolution":["supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported","supported"],"editorialState":["seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed","seed"],"evidenceIds":[["evidence-cpo-orb-oc1-lumen-2024-1"],["evidence-cpo-orb-oc1-suncatcher-2025-1"],["evidence-cpo-orb-oc1-spacex-2026-1"],["evidence-cpo-orb-oc2-ascend-2024-1"],["evidence-cpo-orb-oc2-lumen-2024-1"],["evidence-cpo-orb-oc2-cavalier-2026-1","evidence-cpo-orb-oc2-cavalier-2026-2"],["evidence-cpo-orb-oc3-lumen-2024-1"],["evidence-cpo-orb-oc3-axiom-2025-1","evidence-cpo-orb-oc3-axiom-2025-2"],["evidence-cpo-orb-oc3-spacex-2026-1"],["evidence-cpo-orb-oc4-lumen-2024-1"],["evidence-cpo-orb-oc4-suncatcher-paper-2025-1","evidence-cpo-orb-oc4-suncatcher-paper-2025-2","evidence-cpo-orb-oc4-suncatcher-paper-2025-3"],["evidence-cpo-orb-oc5-ascend-2024-1"],["evidence-cpo-orb-oc5-nvidia-starcloud-2025-1"],["evidence-cpo-orb-oc5-lincei-2026-1"],["evidence-cpo-orb-oc6-lumen-2024-4","evidence-cpo-orb-oc6-lumen-2024-1","evidence-cpo-orb-oc6-lumen-2024-2","evidence-cpo-orb-oc6-lumen-2024-3"],["evidence-cpo-orb-oc6-suncatcher-blog-2025-1","evidence-cpo-orb-oc6-suncatcher-blog-2025-2"],["evidence-cpo-orb-oc6-turyshev-2026-1","evidence-cpo-orb-oc6-turyshev-2026-2"],["evidence-cpo-orb-oc6-cavalier-2026-1","evidence-cpo-orb-oc6-cavalier-2026-2"],["evidence-cpo-orb-oc7-lumen-2024-1","evidence-cpo-orb-oc7-lumen-2024-2"],["evidence-cpo-orb-oc7-suncatcher-paper-2025-1"],["evidence-cpo-orb-oc7-cavalier-2026-1"],["evidence-cpo-orb-oc8-lumen-2024-1"],["evidence-cpo-orb-oc8-suncatcher-paper-2025-1"],["evidence-cpo-orb-oc8-spacex-2026-1"],["evidence-cpo-orb-oc9-spacex-2026-1"],["evidence-cpo-orb-oc9-turyshev-2026-1","evidence-cpo-orb-oc9-turyshev-2026-2"],["evidence-cpo-orb-oc9-cavalier-2026-1","evidence-cpo-orb-oc9-cavalier-2026-2","evidence-cpo-orb-oc9-cavalier-2026-3"],["evidence-cpo-orb-oc10-suncatcher-blog-2025-1"],["evidence-cpo-orb-oc10-turyshev-2026-1"],["evidence-cpo-orb-oc11-lumen-2024-1","evidence-cpo-orb-oc11-lumen-2024-2"],["evidence-cpo-orb-oc11-lincei-2026-1","evidence-cpo-orb-oc11-lincei-2026-2","evidence-cpo-orb-oc11-lincei-2026-3"],["evidence-cpo-orb-oc11-marcy-2026-1","evidence-cpo-orb-oc11-marcy-2026-2","evidence-cpo-orb-oc11-marcy-2026-3","evidence-cpo-orb-oc11-marcy-2026-4"],["evidence-cpo-orb-oc11-swf-2026-1","evidence-cpo-orb-oc11-swf-2026-2","evidence-cpo-orb-oc11-swf-2026-3"],["evidence-cpo-orb-oc7-kolasinski-1989-1","evidence-cpo-orb-oc7-kolasinski-1989-2","evidence-cpo-orb-oc7-kolasinski-1989-3"],["evidence-cpo-orb-oc8-espi-2025-1","evidence-cpo-orb-oc8-espi-2025-2","evidence-cpo-orb-oc8-espi-2025-3"],["evidence-cpo-orb-oc9-espi-2025-1","evidence-cpo-orb-oc9-espi-2025-2","evidence-cpo-orb-oc9-espi-2025-3","evidence-cpo-orb-oc9-espi-2025-4"],["evidence-cpo-orb-oc11-aili-2025-1","evidence-cpo-orb-oc11-aili-2025-2"],["evidence-cpo-orb-oc11-lumen-2024-states-1","evidence-cpo-orb-oc11-lumen-2024-states-2"],["evidence-cpo-orb-oc3-periola-kolawole-2019-1"]],"attributes":[{"thought":{"roles":["earliest-located"],"register":"nonfiction","attested":{"date":"2024-12-24","note":"The cover prints September 2024 (v1.01). 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