1. The fleet built in silence

Liu Cixin’s The Three-Body Problem includes civilizations that build enormous structures in space over timescales humans can barely comprehend. The desktop is not that large, but it shares the idea that some things are easier to build in space than to launch finished. On-orbit assembly is the desktop’s central logistical bet.

Entry 203 covered radiation and reliability. This entry asks how the desktop gets put together in the first place.

2. Launch in modules

A 10 kW desktop with large arrays, radiators, and multiple attachment bays is unlikely to fit in a single fairing fully deployed. The practical approach is to launch modules: a core bus module, a power module with folded arrays, a radiator module, and attachment modules.

Each module must be self-sufficient enough to survive from launch to integration. The core bus needs its own power, thermal control, and attitude system so it can wait for the next module.

3. Rendezvous and docking

Modules rendezvous and dock with the core using standardized interfaces. These interfaces include mechanical capture, power connection, data connection, and fluid lines if needed. The docking mechanism can be similar to those used for satellite servicing, but designed for repeated use.

Some modules may dock autonomously. Others may need the desktop’s arm or a keeper tug to maneuver them into place.

4. Deployment after mating

After modules are connected, deployable systems unfold: solar arrays, radiators, antennas, and any stowed attachment structures. Deployment is a critical phase. Each deployment must be reversible or recoverable if it hangs.

The desktop grows in stages: core first, then power, then thermal, then attachments. Each stage adds capability and is tested before the next arrives.

5. Attachment installation

Customer attachments arrive later, by dedicated launch or via a visiting tug. The desktop’s robotic arm installs them in the standardized bays. This is where the desktop becomes a workstation rather than a bus.

Some attachments may be installed before the desktop is fully operational, but most will come after the core systems are proven.

6. Testing in orbit

Each assembly step is followed by testing: power, thermal, communications, pointing, and robotic operations. The desktop is not declared operational until the core functions are verified. This gradual commissioning reduces the risk of a single catastrophic failure during initial activation.

What this changes

  • The desktop is assembled on orbit from a core bus, power module, radiator module, and attachment modules.
  • Standardized docking and attachment interfaces enable modular growth.
  • Deployment happens after mating, in stages, with testing between steps.
  • Attachments are installed after core systems are proven.
  • The next leisure entry can ask who builds and operates all these modules.