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Only the ones we know of.

• droithomme 7y ago
  Not necessarily. It is true that the industrial civilizations we know of, considered on a consolidated planetary short-recent-history level, have launched satellites in geostationary orbits. But we can not logically infer from this that only the ones we know of have launched satellites in geostationary orbits. There may be ones that have launched geostationary satellites which we do not know of.