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The AN/FPS-133 Air Force Space Surveillance System, colloquially known as the Space Fence, was a U.S. government multistatic radar system built to detect orbital objects passing over the United States. It was a component of the U.S. Space Surveillance Network, and according to the U.S. Navy was able to detect basketball sized objects at heights up to 30,000 km (19,000 mi).
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