Materials

The frame

Everything Off Earth Is Made From a Short List

The question is not what exists in space. It is what a given site can turn into hardware, and what it must keep importing from Earth.

The space economy reduces to three layers. Elements are the raw feedstock a body actually offers in usable grade — oxygen and metals in lunar regolith, carbon and hydrogen in Martian water and atmosphere, volatiles in the outer system. Primitives are the irreducible hardware building blocks every machine comes down to: fasteners, bearings, seals, wire, tubing, optics, and the minimum machine shop that makes them. Finished devices are everything built from those two. A thing you cannot make reduces to a primitive you cannot make.

Every item sits on one line, ship or make. Cheap, bulky things — shielding, berms, structure — are produced locally the moment power exists. Complex, information-dense things — semiconductors, catalysts, enriched fuel — ship from Earth until the local base is deep enough to close them, and a few never close at all. Where the line falls is set by energy, not by what ore is underfoot. Building

The registers

Elements and Primitives, Counted

Two inventories underlie every ship-or-make call: what is available, and what any machine reduces to.

The Forgotten Primitives are the pieces that gate closure quietly because they are assumed available — seals, bearings, lubricants. A base that can forge steel but cannot make a gasket is still on the resupply clock.

Ship or make

The Line Between Import and Make Is Drawn in Energy

Sort every product by the specific energy of its transformation and the build order falls out on its own.

Each rung waits on the local power plant to grow about tenfold, so what a site can make in a given year is an output of its reactor schedule, not its ore body. The Ship-or-Make Threshold is the instrument that places a specific item on this line for a specific site.

Permanent imports

The Short List That Never Closes

A handful of materials have no local route for the foreseeable future and ship from Earth permanently.

The permanent imports are trace materials, never bulk ones: HALEU and plutonium-238, which need enrichment and breeding no off-Earth site will run soon; platinum-group catalysts such as iridium, unless electrolyzers move off them; helium; deliberately imported carbon fiber; and advanced semiconductors until a full fabrication plant exists off Earth. The chip case is the sharpest — every leading-edge node today is TSMC in Taiwan, with SpaceX’s Terafab and, in China, SMIC as the terrestrial efforts, and an off-world fab is far out. China also refines most of the world’s rare earths and much of its platinum-group supply, so it shapes who can even sell the imports. Earth’s ore bodies were concentrated by liquid water and plate tectonics over billions of years; most bodies ran those processes weakly and stopped.

Manufacturing

The Minimum Shop That Starts Closing the Loop

Closure begins with the smallest fabrication base that can make its own spares and tools.

The Machine Shop MVP is the smallest fabrication capability that lets a site build its own spares and tooling rather than wait on a resupply window. Once the garage exists, the ship-or-make line moves: items that were imports become makes, and the base stops consuming launch mass on parts it can cut itself. Manufacturing is where the Element Register and the Primitives Register meet the power plant — raw feedstock in, primitives out, and the resupply clock slowing with every rung the reactor unlocks.

Contested

Deliberately Not Claimed

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

Record

Provenance and Data Sources