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In almost 50 years of space activities, more than 5200 launches have placed some 7500 satellites into orbit, of which about 4300 remain in space; only a small fraction − about 1200 − are still operational today. This large amount of space hardware has a total mass of more than 7500 tonnes.
Not all objects are still intact.
More than 23 000 objects in Earth orbit (as of January 2017) in total are regularly tracked by the US Space Surveillance Network and maintained in their catalogue, which covers objects larger than approximately 5 to 10 cm in low Earth orbit and 30 cm to 1 m at geostationary altitudes.