The end of a satellite mission begins with decisions made before launch

A satellite's working life is only one part of its presence in orbit. What happens after operations stop can influence the safety of other spacecraft for years, making disposal planning an engineering task from the beginning of a mission.

Space debris includes inactive satellites, rocket components and fragments. Collisions or break-ups can create additional objects, which is why reducing the number of abandoned systems matters. Operators also need to consider energy left in batteries and fuel systems after a mission ends.

ESA's debris mitigation work combines measures such as safe disposal, limiting accidental break-ups and improving the ability to track objects. The appropriate end-of-life approach depends on an orbit and the spacecraft's capabilities. A plan on paper must still work if a mission encounters failures or loses some of its remaining performance.

The wider challenge is coordination. Each spacecraft shares its environment with other missions, so a decision that appears acceptable in isolation can contribute to a larger problem. Designing for the final stage, reserving the resources needed to carry it out and verifying the outcome are practical parts of keeping useful orbital regions available.