Resident space object

A resident space object (RSO) is a natural or artificial object that orbits another celestial body. For example, it may orbit the Sun, Earth, or Mars. The term RSO is most often applied to Earth-orbiting objects, in which case the possible orbit classifications for an object are low Earth orbit (LEO), medium Earth orbit (MEO), high Earth orbit (HEO) or geosynchronous Earth orbit (GEO).

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