Thor-Agena was a series of orbital launch vehicles build by Douglas Aircraft Company. The rockets used Thor first stages and Agena second stages. They are thus cousins of the more-famous Thor-Deltas, which founded the Delta rocket family. The first attempted launch of a Thor-Agena was in January 1959. The first successful launch was on 28 February 1959, launching Discoverer 1. It was the first two-stage rocket to place a satellite into orbit.
Among other uses, the clandestine CORONA program used Thor-Agenas from June 1959 until January 1968 to launch United States military reconnaissance satellites operated by the CIA. During this program, Thor-Agena launch vehicles were used in 145 launch attempts  now known to have been part of satellite surveillance programs.
Also, Alouette 1, Canada's first satellite, was launched on a Thor-Agena-B.
- 16 launches between 21 January 1959 and 13 September 1960.
- The Discoverer 14 satellite used in the CORONA spy satellite program was launched by a Thor-Agena-A. On 19 August 1960 usable photographic film from the satellite was recovered by a Fairchild C-119 Flying Boxcar recovery aircraft. This was the first successful recovery of film from an orbiting satellite and the first mid-air recovery of an object returning from Earth orbit.
- First successful launch: 12 November 1960 with Discoverer 17.
- Last launch: 15 May 1966 with Nimbus 2.
- First launch: 28 June 1962.
- Last launch: 17 January 1968.
- Day, Dwayne; Logsdon, John; Latell, Brian (1998). Eye in the Sky: The Story of the Corona Spy Satellites. Smithsonian Institution Press. pp. 236–245. OCLC 36783934.
- "Discoverer-14 1960-010A". NASA. 14 May 2020. Retrieved 6 January 2021. This article incorporates text from this source, which is in the public domain.
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