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The Air Force Space Surveillance System was a U.S. government multi-static radar system built to detect orbital objects passing over the U.S. It was a component of the U.S. space surveillance network, and according to the U.S. Navy was able to detect basketball sized (29.5 inches (75 cm)) objects at heights up to 30,000 km (15,000 nautical miles.)
The system ceased operation in September 2013. Plans for a new space fence are underway with sites at the Kwajalein Atoll in the Marshall Islands, along with an option for another radar site in Western Australia.