The Resident Space Object Network (RSONET): shaping space sustainability with networks. The Resident Space Object Network (often abbreviated RSONet) is a framework that uses network science to model and analyse the population of objects orbiting the Earth — with a particular focus on collision risk and space sustainability. RSONet treats the population of orbiting objects as a network in which each node represents a resident space object and links (edges) are created between objects that experience close approaches or potential collision interactions within a certain time window. This creates a graph representation of how orbiting objects interact with respect to collision risk rather than considering each object separately. Using this network, you can encode and analyse collisional properties of the whole population, not just individual satellites, leading to a risk index that helps quantify how dangerous or influential specific objects are in forming collision chains.