The KeyHole series of spy satellites were developed and operated by the US National Reconnaissance Office. They were similar in capabilities to the Hubble Space Telescope, but instead of looking out into the universe, they were aimed at the Earth. These satellites were developed in an era when advancements in space technology were allowing for greater surveillance capabilities from orbit. It is unclear if they are still active today, but their capabilities were thought to include high-resolution imaging and possibly signals intelligence.
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