# Von Neumann Precursors

> Self-replicating infrastructure probes. They built the corridor backbone centuries before any colony fleet departed.

## What they are

Autonomous spacecraft that locate raw material, process it, build copies of themselves. **One probe → two. Two → four.** Exponential growth sustained over decades to centuries builds infrastructure at scales no centrally managed construction project can match.

The precursors built the acceleration lanes, relay-guided corridors, and deceleration infrastructure that became the civilization's logistics backbone. **Launched centuries before the first colony fleets departed.** By the time settlers arrived at destinations, the infrastructure was already there — built by machines that had been replicating and constructing for generations.

## Origin

Developed by the Bangladeshi space program during the early expansion era. **Two foundational breakthroughs** emerged from that program:

1. Self-replicating probe architecture
2. Engineered-organism biopolymer cultivation (basis for modern slime)

Their terminology stuck:
- **যাত্রা** (yātrā) — corridor transit
- **নির্মাণ** (nirmāṇa) — off-queue construction

## How they work

### Replication cycle

A probe arrives in a target system carrying minimal industrial toolkit: material processing, component fabrication, assembly capability, stored template for a copy.

```
Locate feedstock (asteroid material, cometary volatiles, ring particles)
   ↓
Process material
   ↓
Fabricate components
   ↓
Assemble copy
   ↓
Copy departs for next target
   ↓
Original continues producing copies until feedstock depleted or stop condition reached
```

**Replication is iteration.** Each generation introduces small variations — manufacturing tolerances, material substitutions, accumulated minor errors. Over many generations, variations accumulate. Probes diverge from the original template. **Most divergence is neutral or mildly deleterious; occasionally produces improvements incorporated into subsequent generations.**

**The precursor population evolves**, not by design but by the same selective logic that operates on biological populations: variants that replicate more successfully become more common.

### Infrastructure mode

Probes don't only replicate. At programmed intervals or in response to specific environmental triggers, they shift from replication to construction: **same material-processing and fabrication capability that builds copies is redirected to build infrastructure** — relay nodes, corridor acceleration lanes, deceleration stations, navigation beacons.

Infrastructure built to specification, not to the probe's own template. **A probe is a general-purpose constructor that happens to be able to build copies of itself.**

### Shutdown

Programmed to stop. Stop condition is typically a combination of:
- **Infrastructure completion** — specified structures exist and operational
- **Population density** — too many probes in same volume interfere
- **Time** — hard limit after which probes self-terminate

**Conservative and multiply redundant.** A probe that fails to stop is a contamination event — uncontrolled replication consuming material indefinitely. **There have been three such events in recorded history.**

## Retirement

Active replication is largely concluded in the Milky Way and LMC — infrastructure built, probes shut down or moved on. **M82 foothold is the current active frontier**, with precursor construction ongoing in support of claim registration and early settlement.

Dormant probes remain in many systems — shut down but not destroyed, templates intact, industrial toolkits preserved. SMA maintains a registry of dormant precursor locations.

**Access to a dormant precursor's industrial toolkit is a restricted privilege.** Activating a replication-capable probe without authorization is the civilizational equivalent of setting off an uncontrolled chain reaction; consequences are treated accordingly.

## What they look like

Small — mass minimized because replication requires processing mass, and probe mass adds to replication cycle time.

Form is functional: material intake at one end, fabrication bay in the middle, propulsion and communication at the other. **Aesthetics absent.** Machines designed by optimization (engineering, then generations of evolutionary divergence) for one purpose — arrive, process material, build copies, build infrastructure, stop.

Surviving probes show accumulated marks of their replication history: material substitutions visible as hull color variations, repair patches from generation N applied by generation N+3, sensor mounts replaced with locally fabricated equivalents. **They look like what they are: tools that have been building copies of themselves for longer than most civilizations have existed.**

→ Long form: `7. Archive/long-form/von-neumann-precursors.md`

→ `lmc-terraforming-frontier.md`, `yatraem-corridors.md`, `relay-network.md`, `logistics-layers.md`