Habitat Anatomy
The nine habitat systems — water, air, food, energy, medicine, fabrication, communications, governance, evacuation — with honest closure claims.
Exploded habitat
Habitat Anatomy
| System | Status | Where it really stands |
|---|---|---|
| Water | PROVEN | ISS recovers about 98% of water, including urine, sweat, and condensate, via the Brine Processor Assembly — inside a resupplied, Earth-supported loop. Closed-loop target ≥98%, treated as the proven floor for design. |
| Air | PROJECTED | Oxygen loop closure via Sabatier + electrolysis; ISS CO₂ reduction is roughly 50% today. Full closure is an active goal, not a fact. Target ≥95% O₂ recovery with N+2 redundancy on life-critical paths. |
| Food | PROJECTED | Controlled-environment agriculture and bioreactors aim at 30–60% caloric closure at a pilot and ≥70% at scale. Not field-proven. Full biological closure (MELiSSA-class) remains a HORIZON goal. |
| Energy | PROJECTED | Photovoltaics + storage are mature; NASA/DOE Fission Surface Power targets ≥40 kWe per unit as the night-and-storm backbone. Space-based solar and fusion are treated as HORIZON, not planning. |
| Medicine | PROVEN | On-site trauma and pharmacy plus telemedicine to Earth specialists; 3D bioprinting of tissue is already research-grade on ISS. Queer-specific medicine must be locally made or multiply redundant. |
| Fabrication | PROVEN | 3D printing of tools and structural parts is routine on ISS; circular recovery targets ≥95% of materials. In-situ resource use is lab-demonstrated, not yet field-proven. |
| Communications | PROVEN | Latency-bounded links where physics allows; identity via member-held keys, never a central database. Spectrum needs multi-year, treaty-bound ITU coordination. |
| Governance | PROVEN | A public commons ledger and liquid-democratic tooling exist today; Ostrom's commons principles run as invariants. Emergency authority is logged and expires automatically. |
| Evacuation | PROJECTED | Assured return sized to the full population, with escrowed return capacity. Any habitat lacking it fails the non-coercion test. Rapid rescue is preserved through every analog phase. |