As of October 2021, over 4,500 objects have been identified, ranging from large probes to small pins and including spent injection stages, rovers, heat shields, parachutes, dust caps, weights, bolts, lanyards, hand tools, foam blocks, sample bags, etc.

All these objects are witnesses of human activity in space and are as valuable as archeological items dug several feet underneath us. Like Egyptian mummies on Earth, it is important that we protect them for both their historical and scientific value as space becomes more accessible to private enterprise, exposing them to inadvertent destruction, seizure and illegal trade. Because small items such as cameras, geology tools or detachable parts are more exposed than large rovers or landers, their presence must be emphasized. This catalogue, the most accurate to date, is a first step in preserving them by establishing what’s actually out there and where it is precisely.