However, the exact number of artificial objects in outer space will never be known. It depends upon how objects are numbered (for instance a flag may be counted as one object or split into its elements: cloth, staff, crossbar, etc.); the number of debris resulting from impacts, collisions and spent stages breakups; objects that come from deployments and separation of spacecraft (explosive bolts, lens caps, clamp bands, fairings, shrouds, etc.) and untold or unknown events (classified missions and experiments, private belongings secretly left on the moon by the Apollo astronauts, family items hidden into space hardware by mission staff and technicians, Apollo hardware unofficially returned to Earth as souvenirs by the astronauts, etc.)
Please note that these relics shouldn’t be called ‘space junk’ and because they are far away from the Earth, they are not threatening us, they won’t fall over our heads.