The Primitives Register

The frame

What Counts as a Primitive

A primitive is a piece of hardware that recurs across three or more regimes, is irreducible with respect to its interface, and shows up in the mass ledger at the 1% level. The test yields about 49 of them.

The register exists to name the irreducible hardware of an off-Earth site without double-counting or vanishing detail. Three screens do the work: a primitive has to recur across at least three regimes, so it is general rather than site-specific; it has to be irreducible with respect to its interface, so a thing and its connector are not counted twice; and it has to carry at least 1% of the mass, so the ledger stays honest. Roughly 49 pieces survive, sorted into seven layers plus a cross-cutting interface layer. Building

The layers

Seven Layers Plus an Interface

Each layer is a function a site cannot do without, and the mass does not land where intuition puts it.

Energy plus mobility and earthmoving is about 44% of a 232-tonne outpost, while the habitat is under 11% and the robots are 7%. The outpost is a power plant with an excavator attached, not a building with machines in it.

The forgotten primitives

The Pieces With No Consumer Analogue

The hardware most easily left off a parts list is the terrestrial infrastructure that normally 'arrives with the building' - and it is nearly half the mass.

A seed list written from consumer intuition names the robots, the solar panels, the habitat, the rover. It leaves out the things that on Earth come free with a developed site: the radiator, the wiring harness, earthmoving, the offload crane, cryogenic storage, fabrication, spares, pads and berms, position and timing, the waste loop, the shelter, the test bench, fasteners, anchoring, and the garage. Those forgotten primitives are about 44% of outpost mass. They are forgotten precisely because no consumer buys one, which is also why no supplier makes one yet. Building

Product vs project

The Drill Bits, Not the Mines

Nine of the 49 are genuine products whose physics is indifferent to location. The rest are per-regime projects.

A primitive is a product when the same unit works at the Moon, Mars, or Callisto without redesign - when its physics does not care where it sits. Nine qualify: the radiator, the device battery, the edge-compute module, the actuator, the connector and fastener set, the relay bus, the humanoid upper body, the module shell, and the electrolyzer. The radiator is the clearest case, at 2.0 to 3.2 m² per kilowatt across 30 AU, because the fourth-power law makes sink temperature nearly irrelevant at ordinary rejection temperatures. Everything else on the stack is a per-regime project, re-engineered for its gravity, dust, and thermal environment. The commercial opening is the nine products, the drill bits rather than the mines - and the product category does not exist until the interface standard does.

The interface

Seven Standards, One Committee-Year

The connective tissue is seven interface standards, and they are the cheapest high-leverage decision in the whole program - until the supplier base commits.

Seven standards let the stack connect: bus voltage, the device battery pack, the mechanical and fastener interface, thermal coupling, the data schema, the pressure and dust boundary, and the fluid disconnect. They carry no research content - a committee-year of agreement, not a laboratory program - and fixing them collapses 400 distinct part types to about 120, removing roughly 70% of spares inventory at constant risk. The catch is timing: once the supplier base has committed to a set of interfaces, they cannot be changed, so the cheapest architecture-shaping decision in the series has the shortest window. Building

Contested

Deliberately Not Claimed

The load-bearing uncertainties, tagged with the confidence they earn.

Record

Provenance and Data Sources