What SpaceX Overlooks

On By konstapelIn Uncategorized

J.Konstapel Leiden, ,17-10-2026

© 2026 J. Konstapel, Constable Research, Leiden. All rights reserved. Quotation with
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Fd-article : Bouwen. Vliegen. Bijsturen. Hoe SpaceX werkt aan het grootste ruimteschip ooit

A settlement on Mars should not be judged only by how much cargo arrives. The more important question is whether it can continue to operate when deliveries from Earth stop. A large shipment can build a settlement, but it cannot by itself make that settlement independent. Independence depends on whether essential systems can renew their own inputs and replace their own losses.

This essay proposes a different way to organise the programme. First, measure how well each essential cycle closes. Second, test life-support and food systems on Earth before sending them to Mars. Third, send a compact industrial seed and the knowledge needed to use local resources. Fourth, count the interfaces between systems, because every interface can introduce a failure point. Fifth, design landed equipment for a useful second life. Finally, judge progress by demonstrated capabilities, not by tonnage alone.

The source paper’s combined model estimates that a settlement of 1,000 people could require roughly 30–114 landings under its stated assumptions, rather than the 10,000 landings implied by a million-tonne transport plan. That is a model result, not a demonstrated mission design. It depends on local manufacturing, early closure of essential life-support loops, and assumptions about industrial growth. The paper also explores a speculative possibility: that the geometry of small gaps might affect measured weight. That proposal is not established physics. It should be separated from the much more practical case for better recycling, local production and disciplined testing.

1. Define success correctly

SpaceX has described the goal as a city that can survive if resupply ships stop arriving from Earth for any reason. This is a demanding standard. It means more than keeping a crew alive until the next launch window. It means having no essential dependency that eventually forces the settlement to request another shipment.

The familiar transport plan measures progress in payload mass and launch frequency. The source paper uses an indicative target of about one million tonnes, delivered over roughly twenty years. With around 1,000 ships per launch window and a window every 26 months, that amounts to about ten major windows and 10,000 landings if each ship delivers 100 tonnes. These figures describe a transport scenario. They do not show whether the resulting city can function independently.

A better measure is closure: the degree to which a system can maintain its function without importing the materials it consumes or loses. Oxygen, water, food, nutrients, energy, machinery and replacement parts each need their own account. A settlement may recycle water well while remaining dependent on imported electronics. It may grow much of its food while losing essential minerals in waste. A single overall percentage can conceal these weaknesses.

The first management tool should therefore be a closure ledger. It should list every essential loop, its measured recovery rate, its losses, its reserve capacity and the evidence behind each figure. Unknown values should be marked as unknown. This ledger should be prepared before the architecture is selected. Otherwise, the team risks choosing a design first and defining success around it afterwards.

2. Close the difficult loops on Earth

A Mars mission should not be the first full test of a settlement’s life-support system. Earth-based trials can reveal failures at much lower cost. They can also be repeated, instrumented and inspected by independent teams.

The source paper points to Lunar Palace 365, a Chinese closed-environment experiment that operated with human crews and crop systems. It reports high closure for oxygen and water, but lower closure for food and solid waste. The paper gives an overall closure figure of 98.2 percent. These figures suggest that recycling air and water is not the only challenge. Food production and the treatment of biological waste remain important sources of dependence.

Small percentages matter. If the unrecovered share of a system falls from 1.8 percent to 1 percent, the required replacement flow can fall substantially, assuming the same accounting boundary and operating conditions. The source paper estimates that improving overall closure from 98.2 to 99 percent reduces imports by a factor of about 1.8. A rise to 99.9 percent would reduce them by about a factor of 18. These are arithmetic illustrations. Real systems may not scale linearly, and different loops may fail in different ways.

The next step should be a sealed greenhouse trial with a crew of realistic size. It should run long enough to reveal cumulative problems. Researchers should measure food output, crop diversity, water recovery, oxygen balance, solid-waste processing, nutrient losses and the need for replacement supplies. The target for each loop should be set in advance. Results should be independently checked.

Past experiments warn against treating a closed habitat as a simple machine. Biosphere 2 experienced a major decline in oxygen, linked in the source literature to biological activity in the soil and carbon dioxide absorbed by concrete. BIOS-3 and other life-support studies also identified persistent losses of nutrients and minerals. These examples do not show that closure is impossible. They show why it must be demonstrated in operation rather than assumed from a design diagram.

3. Send an industrial seed, not the whole city

The central economic opportunity is to use Martian resources for most of the settlement’s bulk material. Mars has regolith, rock, atmospheric carbon dioxide and, in some locations, water ice. These resources are not ready-made construction materials. They must be mined, processed and converted. Yet processing local material may be more practical than lifting every wall, tank and spare part from Earth.

The source paper calls the initial industrial package a seed. It would include robots, power systems, tools, manufacturing equipment and the instructions needed to operate and expand them. Its purpose is to establish a production chain. The seed would make more equipment, which would then expand the production chain. The goal is to reduce the share of each new installation that still has to be imported.

Research cited in the source paper describes robotic processing of regolith, casting in sintered-regolith moulds, sulphur-based concrete, plant growth in Martian soil simulants, cyanobacteria grown under simulated Martian conditions and biological extraction of metals from basalt. Each result addresses a part of the problem. None, by itself, demonstrates a complete Martian industrial economy.

The crucial metric is the imported share of each class of equipment. Call this share f. It should be measured separately for electronics, bearings, seals, sensors, catalysts, motors and other components. A factory may produce most of its structure locally while remaining dependent on imported control electronics. Such a factory is productive, but not yet independent.

The source paper uses a growth model derived from earlier work on self-replicating manufacturing systems. It estimates that a 41-tonne seed could support a much larger installed industrial base over successive generations. The paper applies that model to Mars, while acknowledging that the growth rate has not been demonstrated under Martian conditions. Solar energy is weaker on Mars than on the Moon, and the availability of materials, maintenance and process control may change the result. The growth schedule must therefore be tested with realistic power and material constraints.

The operational rule is simple: ship the knowledge and the minimum equipment needed to begin production. Then measure, generation by generation, which components can be made locally. Do not count a component as locally available merely because its housing can be manufactured on Mars. The full component must work to the required specification and lifetime.

4. Count interfaces and reduce failure points

Complex systems fail not only because individual components are weak. They also fail at the interfaces between components. Materials expand at different rates. Seals leak. Electrical connectors corrode or loosen. Fluids cross boundaries. Thermal protection must remain attached to the structure beneath it.

The source paper calls these interfaces seams. It borrows a formal result from the Vacuum.Net Theory: in the theory’s mathematical model, two differently closed triples cannot both close across the boundary in the same way. The paper then reads this as a reason to count engineering interfaces. The mathematical result concerns the theory’s defined trits. Applying it to actual machines is an interpretation, not a proven law of engineering. Still, interface counting is a useful engineering practice in its own right.

Consider a heat shield. The metal structure and ceramic tiles have different thermal properties. Their attachment points and gaps require careful design. The source paper proposes a test using photographs of recovered upper stages. Investigators would define the seam area before inspecting tile damage. They would then test whether damage is concentrated at seams more often than the seam area alone would predict. The test should specify its failure threshold in advance. If the public photographs are too few, the result should be reported as inconclusive.

The same approach can compare transport architectures. A design may involve launch, staging, docking, propellant transfer and landing. Each transition introduces hardware, procedures and opportunities for failure. The source paper estimates 13–18 seams for one Starship design case and 5–7 for a minimum case. These counts depend on the counting rule and mission assumptions. They should not be treated as universal values.

Before selecting an architecture, engineers should publish a clear interface-counting rule. They should count every candidate design using the same rule. They should repeat the comparison under a second reasonable rule. If the ranking changes, the result is too sensitive to the definition to support a confident choice. When mass and performance are otherwise comparable, a design with fewer difficult interfaces may be easier to operate and maintain.

5. Treat landed hardware as industrial stock

A one-way cargo vehicle does not have to be waste. Its structure, tanks, engines and other components may become useful material on Mars. The source paper estimates a dry mass of about 100 tonnes for a landed Starship, but explicitly marks this figure as an assumption that requires confirmation from primary SpaceX data.

The idea is to design for a second life from the beginning. Tanks might become pressure vessels or storage units. Structural sections might become supports. Selected engine components could become spare parts. Steel could be processed as feedstock. The exact uses would depend on material properties, contamination, inspection and the tools available on Mars.

The same principle applies to waste from other activities. Crop residues may become inputs for biological materials. Sulphur may serve as a binder. Processed regolith may become bricks or construction elements. These are promising directions, but each requires testing for strength, durability, toxicity and performance in Martian conditions.

A useful design review should ask three questions about every major item sent to Mars. What is its primary function? What can it become after that function ends? What equipment is needed to reuse it safely? A second life has value only when the conversion process is practical. Reuse should be engineered, not assumed.

6. Choose transport methods with a common scorecard

The source paper discusses several ways to reduce the burden of transport. These include one-way ships, propellant production on Mars, water ice instead of water-bearing regolith, oxygen production from local resources, lunar water as a possible supply and alternative launch infrastructure. The options differ in maturity and should not be treated as equally available.

Making propellant on Mars could reduce the need to transport return fuel from Earth. NASA studies have examined production of methane and oxygen from local resources. The source paper calculates that a large return load would require substantial plant capacity and power. That makes local propellant a strategic option, but not a free resource. The settlement must first build the extraction, processing, storage and power systems needed to produce it.

Water ice may require less energy to process than extracting small amounts of water from regolith. But the relevant ice deposits must be located, characterised and reached. The choice of landing site therefore affects the whole industrial plan. A site with accessible ice may be preferable to a site with better conditions in another category, but only after the trade-offs are quantified.

Aerocapture could reduce the amount of propellant needed for arrival by using the atmosphere to remove orbital energy. The source paper notes that the approach has not been demonstrated in the relevant operational context. It should be treated as a technology-development option, not as guaranteed savings.

All transport choices should use one scorecard. It should include landed mass, propellant, energy, interface count, operational maturity, repairability, local resource requirements and consequences of failure. The cheapest option on paper may not be the most reliable. The best option is the one that performs well under a transparent set of assumptions and can be tested before it becomes mission-critical.

7. Measure progress by demonstrated capabilities

A programme can report many launches and still fail to establish a self-sustaining settlement. It can also make important progress before delivering large amounts of cargo. A successful test of a closed water loop, a reliable local manufacturing process or a replacement part made from Martian feedstock can reduce future dependence.

The programme should use milestones that can be observed and independently verified. Examples include: a life-support loop that operates for a defined period; a greenhouse that meets a pre-set food target; a manufacturing unit that produces a specified part; a second-generation machine that builds a working third-generation unit; and a maintenance team that repairs equipment without imported components.

Tonnage and cost remain important. They should be treated as outputs of the design, not as substitutes for operational independence. The programme should report both the amount delivered and the amount of essential function that can be sustained locally. Each claim should state whether it is measured, calculated from stated assumptions, inferred from a model or still open.

The source paper notes a large gap between the Starship flight rate it calculates for a million-tonne programme and the flight rate represented by the launch history available to it. That gap is a reminder to separate demonstrated capability from planned scale. A projection is not an operational rate. The schedule should change when the evidence changes.

8. The unresolved question of weight

The paper also explores a more speculative idea. In the Vacuum.Net Theory, matter is described as a stable closure in a larger net. The theory proposes that some effective constants may depend on the local state of that net. The paper asks whether the geometry of small gaps could alter the measured weight of an object.

It distinguishes two routes. The first would require changing or opening the closure associated with mass. The paper concludes that the energy cost of this route is vastly greater than the energy needed to lift a kilogram into low Earth orbit. It therefore treats this route as impractical.

The second route proposes that geometry might change the state of the net around an object. Under a set of explicit assumptions, the paper’s path model predicts a possible difference in weight for objects built with narrow gaps. The paper compares this idea with earlier measurements of stacks of metal discs and a solid cylinder. It acknowledges that the existing measurements do not settle the question.

This proposal is not an established method of reducing gravity or launch energy. The connection between the theory’s mathematical variables and gravitational coupling remains unproven. The predicted magnitude also depends on assumptions about length scales, path duration and which parts of an object respond to a gap. A mathematical calculation inside a model does not establish that the effect exists in nature.

The paper proposes a useful scientific discipline: define the prediction before taking the measurement. Compare the same discs using spacers of about 2 millimetres and shims of about 20 micrometres. Use the same mass comparator, preferably under controlled vacuum conditions. Specify the expected signal, uncertainty and failure criterion in advance. Independent laboratories should repeat the experiment.

A null result would constrain or reject the specific version of the proposal being tested. A positive result would require replication and checks for ordinary causes, including geometry, temperature, air currents, magnetic effects, contact forces and calibration. Until independent results support the claim, no Mars transport plan should assume a reduction in weight or launch energy.

9. The human settlement is part of the engineering

A settlement is not a collection of machines. It is a community that must maintain those machines, make decisions and care for its members. The source paper identifies several unresolved human questions: radiation exposure, life at 0.38 g, long-term reproductive health, isolation, delayed communication and the loss of familiar institutions.

Radiation is a major constraint during transit and on the Martian surface. Shielding with local material may reduce exposure, but it adds requirements for excavation, structure and access. Partial gravity raises another uncertainty. The source paper cites animal studies, but long-term human outcomes at Martian gravity remain unknown. Short experiments cannot establish the safety of living and reproducing at 0.38 g for decades.

Isolation and group dynamics also require planning. Antarctic stations and controlled-environment studies provide useful evidence, but they are not identical to a permanent settlement on Mars. Communication delays make direct supervision from Earth difficult. Medical care, education, conflict resolution and governance must work locally.

The source paper discusses a founding group of around 110 adults as a possible labour minimum, based on secondary reporting of demographic analysis. That figure should not be read as a complete design for a resilient society. Skills, health, redundancy, age structure, social compatibility and emergency capacity all matter. The population model must be tested against the work that actually needs to be done.

Biological diversity also matters. Plants, microbes and other organisms may be necessary parts of food production, waste treatment and nutrient cycling. Research on frozen mouse sperm and embryos in space offers limited evidence about biological preservation. It does not demonstrate safe human reproduction on Mars. That remains an open question requiring careful, staged research.

A credible plan should make human safety a design requirement. It should not treat people as interchangeable cargo or assume that local institutions will emerge automatically. A self-sustaining settlement needs both closed material cycles and a community capable of sustaining them.

10. A staged programme

The source paper’s practical sequence is to carry out the cheapest tests before committing to expensive launches. A revised programme can be organised as follows.

Stage 1 — Establish the baseline. Create a closure ledger for oxygen, water, food, nutrients, waste, energy, metals, polymers, electronics and spare parts. Record measured values separately from assumptions.

Stage 2 — Improve Earth-based life support. Run a sealed greenhouse and life-support system at realistic crew scale. Set targets and failure criteria before the trial. Publish the full material balance.

Stage 3 — Validate industrial processes. Test regolith processing, metals, ceramics, polymers, biological systems and repair methods. Include power demand, wear, maintenance and product quality.

Stage 4 — Compare architectures. Use common assumptions to compare transport options. Count interfaces, identify failure modes and test whether the ranking survives alternative reasonable counting rules.

Stage 5 — Test local manufacturing growth. Track each equipment class across successive generations. Verify that locally produced parts meet specifications and that the imported fraction is falling.

Stage 6 — Resolve human risks. Develop a staged research programme for radiation, partial gravity, medical care, reproduction, social organisation and emergency response.

Stage 7 — Send the industrial seed. Only after the enabling systems have met pre-defined requirements should the programme commit to a seed package. Match crew arrival to verified production capacity.

Stage 8 — Expand by evidence. Increase the settlement’s population and industrial capacity only as the closure ledger and operational record justify it. Treat each expansion as a new engineering decision.

Conclusion

The central issue is not whether a million tonnes can be transported to Mars. It is whether the resulting settlement can survive without further deliveries. Transport capacity is necessary, but it is not the same as independence.

The most practical route begins with measurement. Establish which systems are closed and which remain dependent on imports. Improve food and waste cycles on Earth. Develop local manufacturing around a compact industrial seed. Reduce unnecessary interfaces. Reuse landed hardware. Compare transport options with consistent assumptions. Advance the population only as life support, production and human safety permit.

The source paper’s combined model estimates that a 1,000-person settlement might need only a small fraction of the million-tonne plan if local production works as assumed. The estimate is worth investigating, but it is not yet a validated mission budget. Its strongest contribution is the question it puts first: what must still come from Earth, and why?

The proposed weight effect belongs in a separate research track. It has a defined experimental question, but its physical basis remains open. It should neither be presented as established science nor used to justify a transport architecture. The settlement programme can make substantial progress without it.

A robust Mars programme should therefore be steered by verified capabilities. Count the loops that work, the parts that can be made locally, the failures that have been removed and the generations of equipment that have been demonstrated. Tonnage and cost should follow from those results. The goal is not simply to deliver a city. It is to build one that can continue to function when Earth is no longer supplying it.

Annotated reference list

The annotations below explain the role of the sources in the argument. As in the source paper, some entries are cited through secondary reports. Such sources should be checked against the original publication before being used to support a critical engineering decision.

A. Theoretical framework and methods

  • Konstapel, J. (2026). The Vacuum.Net Theory: Definition, Theorems and Tests, version 4. Constable Research, Leiden. The source paper’s conceptual framework. It defines closure, seams, scale and the theory’s tests. It is a primary source for the author’s own theory, not independent confirmation of its physical claims.
  • Konstapel, J. (2026, 25 September). Applied Vacuum Theory: Setting the State of the Net. constable.blog. https://constable.blog/2026/09/25/applied-vacuum-theory/ Develops the proposed relation between coupling and the local state of the net. The paper itself labels parts of the bridge as assumed. Read the status ledger before treating the proposed relation as a physical result.
  • Konstapel, J. (2026, 27 September). Applied Vacuum Theory, Part Four: Energy as Passage. https://constable.blog/wp-content/uploads/def2Applied-Vacuum-Theory-PartFour-Energy-as-Passage-The-Step-from-Mesh-to-Output-1.pdf Sets out the author’s proposed relation between passage through a mesh and energy. The cited power density is described as extrapolated rather than measured.
  • Konstapel, J. (2026, 28 September). The Vacuum.Net Theory: Complete Derivation. https://constable.blog/2026/09/28/the-vacuum-net-theorycomplete-derivation/ Presents the broader derivation behind the theory, including the distinction between passage through a mesh and opening a closure. Useful for understanding the framework’s internal logic.
  • Konstapel, J. (2026, 9 October). Transmutation: Elements on Demand. https://constable.blog/2026/10/09/transmutation-elements-on-demand/ Explores the idea of an element as an address plus a state and compares energy scales. The numerical interpretation should be checked against the derivation and stated units.
  • Watson, G. N. (1939). “Three triples of the lattice.” Quarterly Journal of Mathematics, 10, 266–276. https://doi.org/10.1093/qmath/os-10.1.266 Mathematical background cited for a three-dimensional lattice-return probability used in the paper’s path model. It supports a mathematical input, not the proposed gravitational interpretation.
  • Pólya, G. (1921). “Über eine Aufgabe der Wahrscheinlichkeitsrechnung betreffend die Irrfahrt im Straßennetz.” Mathematische Annalen, 84, 149–160. https://doi.org/10.1007/BF01458701 Classic work on random walks and returns to previously visited sites. Relevant to the mathematical model used by the Vacuum.Net Theory.
  • CODATA / NIST (2018). Fundamental Physical Constants. https://physics.nist.gov/cuu/Constants/ Reference values for physical constants used to define the theory’s natural units. These constants are standard inputs; their use does not independently validate the theory built from them.

B. Mars settlement goals and transport

  • CNBC (9 March 2020). “How Elon Musk sees life on Mars.” https://www.cnbc.com/2020/03/09/spacex-plans-how-elon-musk-see-lifeon-mars.html Secondary reporting of Musk’s stated goal that a Mars city survive without resupply, and of the million-tonne order of magnitude. Used in the source paper to define the objective.
  • Space.com (January 2020). “Elon Musk’s Starship flights to Mars colony.” https://www.space.com/elon-musk-starship-spacex-flights-marscolony.html Reports the concept of roughly 1,000 ships departing over about 30 days every 26 months. It describes a planning concept, not a demonstrated launch cadence.
  • Musk, E. (2017). “Making Humans a Multi-Planetary Species.” New Space, 5(2). https://static.ukrinform.com/files/1497612705-9227.pdf A primary presentation of an earlier Mars transport and settlement architecture. The source paper uses its estimates for cost per tonne and tanker flights. These are historical design estimates, not current guaranteed costs.
  • Maiwald, V. et al. (2024). Scientific Reports, 14, 11804, with correction. https://pmc.ncbi.nlm.nih.gov/articles/PMC11116405/ An independent mass-budget study cited as finding no feasible return scenario under its analysed assumptions. Useful as a counterweight to optimistic transport projections; its scope and correction should be read directly.

C. Closed life support and food production

D. Local manufacturing and Martian resources

  • Metzger, P. et al. (2016). arXiv:1612.03238. https://arxiv.org/abs/1612.03238 Models a self-expanding manufacturing system using a compact initial industrial package. It is central to the source paper’s seed-growth calculation. Applying the model to Mars requires new assumptions about power, materials, reliability and production rates.
  • Chirikjian, G., Zhou, Y. and Suthakorn, J. (2002). Robotics and manufacturing without conventional microprocessors. https://rpk.lcsr.jhu.edu/wp-content/uploads/2014/08/Chirikjian02_b.pdf Explores simple robotic systems and manufacturing methods that reduce dependence on advanced electronics. Relevant to designing equipment that can be repaired or reproduced with limited industrial resources.
  • Menezes, A. et al. (2015). Journal of the Royal Society Interface, 12, 20140715. A quantitative source on potential mass savings from biologically produced fuels, food and polymers. Useful for evaluating biological manufacturing, though each process requires its own operating assumptions.
  • Cockell, C. et al. (2020). “BioRock.” Nature Communications, 11, 5523. https://www.nature.com/articles/s41467-020-19276-w Studies biological interaction with rocks and the potential for biomining. The source paper cites it as evidence for a possible route to obtaining metals from basalt under simulated conditions.
  • Wamelink, G. et al. (2014). PLOS ONE, 9, e103138. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0103138 Reports plant growth experiments using Mars and Moon soil simulants. It supports further research into regolith-based cultivation, but does not establish that untreated Martian soil is safe or sufficient for crops.
  • Verseux, C. et al. (2021). Frontiers in Microbiology, 12, 611798. https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2021.611798/full Investigates cyanobacteria under simulated Martian atmospheric conditions. Relevant to biological resource use; laboratory growth is not equivalent to a complete production system.
  • Wan, L., Wendner, R. and Cusatis, G. (2016). “Sulphur concrete for Mars.” arXiv:1512.05461. https://arxiv.org/abs/1512.05461 Examines sulphur-based concrete using Martian regolith simulant. It provides a candidate construction material and a basis for further durability and process testing.

E. Propellant, water and transport infrastructure

F. Habitats, health and human factors

G. Tests relevant to the proposed weight effect

  • Duan, X. et al. (2016). arXiv:1602.06377. https://arxiv.org/abs/1602.06377 Examines free fall in relation to spin state. Cited as a constraint on possible spin-dependent effects.
  • Heckel, B. et al. (2008). arXiv:0808.2673. https://arxiv.org/abs/0808.2673 Reports a spin-polarised torsion-pendulum test. Relevant to limits on anomalous spin-related interactions.
  • Rosi, G. et al. (2017). arXiv:1704.02296. https://arxiv.org/abs/1704.02296 Tests equivalence-principle behaviour involving internal energy states. Relevant to whether internal state can alter free fall.
  • Schlamminger, S. et al. (2008). arXiv:0712.0607. https://arxiv.org/abs/0712.0607 Reports a comparison of beryllium and titanium free fall. It constrains composition-dependent deviations from the equivalence principle.
  • Touboul, P. et al. (2022). MICROSCOPE mission results. https://arxiv.org/abs/2209.15487 Provides high-precision tests of the equivalence principle for different materials. It is a key experimental constraint on composition-dependent gravity.
  • Lee, J. et al. (2020). arXiv:2002.11761. https://arxiv.org/abs/2002.11761 Reports constraints on additional interactions at short distances. Useful for establishing which ranges of parameter space have been tested.
  • Chen, Y.-J. et al. (2016). arXiv:1410.7267. https://arxiv.org/abs/1410.7267 Examines short-range forces at sub-millimetre scales. The source paper uses it to distinguish experimental limits from the gravitational-strength regime relevant to its proposal.
  • Berry, J. et al. (2013). NPL Report ENG 46. https://eprintspublications.npl.co.uk/5985/1/ENG46.pdf Describes precision weighing of stacks of metal discs and a solid cylinder. It is the closest existing measurement cited in the source paper for the proposed gap experiment. The objects were adjusted to the same mass, so the original measurement does not by itself establish a gap-dependent weight effect.
  • Calloni, E. et al. Archimedes project. https://arxiv.org/abs/1511.04269 Describes an experiment designed to measure changes in weight associated with a material-state transition. Relevant as a measurement approach, but not evidence for the specific gap mechanism proposed here.
  • Moddel, G. et al. (2021). Symmetry, 13, 517. https://arxiv.org/abs/2101.03085 Reports measurements involving electromagnetic cavities and small power outputs. The source paper notes the authors’ caveats about plasmonic effects. This work does not establish a gravitational effect.
  • ALPHA-g Collaboration (2023). Nature. https://www.nature.com/articles/s41586-023-06527-1 Reports a measurement of antihydrogen’s response to gravity. It is relevant to the broader question of how antimatter falls.
  • Tajmar, M., Neunzig, O. and Weikert, M. (2022). CEAS Space Journal, 14. https://fis.tu-dresden.de/portal/en/publications/highaccuracy-thrust-measurements-of-the-emdrive-and-elimination-offalsepositive-effects(a2fc9b62-64b8-45db-8588-7a7d00725d7f).html Reports high-accuracy thrust measurements and analysis of false-positive effects in EmDrive tests. Useful as a caution about thermal artefacts and experimental controls.
  • Woods, R. et al. (2001). AIAA 2001-3363, via arXiv:physics/0204031. https://arxiv.org/abs/physics/0204031 Reports replication work on claims of gravity shielding by superconductors. The source paper cites the null or very small results as a reason not to rely on such claims.
  • Faller, J. et al. (1990). Physical Review Letters, 64, 2115. Reports measurements involving spinning gyroscopes and alleged weight changes. Cited as evidence that the reported effect was not established at the claimed magnitude.
What the Mars Plan OverlooksDownload