Space-based data processing has emerged as a critical need for modern satellite missions in Earth observation, communications, and defense. We present DCiS (Data Center in Space), a distributed micro-data-center architecture optimized for SmallSat-class spacecraft. By deploying many small computing nodes across an orbital constellation and interconnecting them via high-speed links, DCiS enables cloud-like computing capabilities in orbit. The proposed architecture emphasizes modular design, fault tolerance, and autonomous operation, bringing terrestrial data center principles into space. We discuss the system’s design – including standardized compute modules, virtualization across satellites, and thermal/power management – and demonstrate how DCiS can achieve scalable performance while overcoming the unique constraints of the space environment. Preliminary analysis and industry developments suggest that such distributed space computing is not only feasible but offers advantages in latency, resilience, and security over traditional ground processing.
