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.

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.