Encyclopedia : K : KH : KH9 (2 articles)

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KH-9
Codenamed Hexagon, the KH-9 was a reconnaissance satellite used by the United States from June 1971 to April 1986. The satellite was popularly known as the Big Bird. The KH-9 was originally conceived in the early 1960s as a replacement for the Corona search satellites. The goal was to search la..

 

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