Holistic space observation: the shift from SSA to SDA

Recent reporting on SpaceX's proposal to deploy up to one million satellites in low Earth orbit — paired with a vision of AI-enabled, autonomous orbital infrastructure — marks a decisive moment for the space community. Regardless of whether these numbers ultimately materialize, the direction is unmistakable: space is moving toward unprecedented scale, autonomy and strategic importance.

For decades, space situational awareness (SSA) focused on orbital mechanics: where an object is, where it will be and whether it might collide with something else. That model is now insufficient. Satellites are no longer passive nodes governed primarily by physics; they are software-defined, networked systems deeply integrated with terrestrial cyber infrastructure, global supply chains and increasingly AI-driven decision loops.

As space evolves into a fully contested and operational domain, awareness must evolve with it. The transition from SSA to space domain awareness (SDA) represents a shift toward holistic space observation: integrating physical, cyber, supply chain, spectrum and autonomous system visibility into a unified understanding of the domain. That shift will not occur organically, it must be driven by the constellation operators and reinforced by acquisition and regulatory frameworks.