The United Earth Space Probe Agency (often UESPA) was a space exploration and scientific research organization, based on Earth, from at least the 21st through 23rd centuries. (TOS: "Charlie X")

21st centuryEdit

Though the Traité d'Unification creating the United Earth Republic was not signed and ratified until 2130 (TNG novel: Articles of the Federation), the agency was in existence as early as 2067, when the unmanned interstellar probe Friendship 1 was launched towards the Delta Quadrant under UESPA's auspices. (VOY: "Friendship One")

The Starfleet Museum continuity asserts that UESPA was founded in 2064. (The Starfleet Museum: Museum Timeline)

UESPA was formed from NASA, ESA and other national space agencies sometime after World War III. (Orion Press: "Lexicon, U-Z", 2010 revision) Its precursor organization was the International Space Agency, which had subsumed many national agencies -- but not NASA -- as early as the 2030s. (VOY: "One Small Step")

The Indonesian Space Agency (Star Trek: First Contact novelization) was a separate entity from UESPA, at least in 2063, when they would have paid any price to acquire Zefram Cochrane's warp drive.

22nd centuryEdit

Cargo ship UES Baikal was modified to carry a short-range subspace communications system and a 100-metre-diameter antenna in 2146. This ship was intended to serve as a mobile command platform supporting United Earth Space Probe Agency operations. (The Starfleet Museum: Baikal Class and Marconi Class)

Prior to the founding of the Federation, UESPA and the Earth Starfleet worked jointly to administer the NX Project as well as the first warp-5 capable ships such as Enterprise (NX-01). (ENT: "First Flight", "Demons")

In The Starfleet Museum continuity, UESPA and the United Earth Star Fleet merged to form the United Earth Stellar Navy (UESN) in 2151. (The Starfleet Museum: Museum Timeline)

23rd centuryEdit

UESPA was the operating authority for both the USS Enterprise and the SS Antares, c. 2267. (TOS: "Charlie X", "Tomorrow is Yesterday")

It may be that at least the five founding members of the United Federation of Planets each had its own space-exploration organization and each contributed funds to Starfleet as well as supported their own survey efforts. (Orion Press: The Plumber's Helper)

Personnel and matériel from UESPA contributed to the building of the Enterprise-B, so the organization existed at least as late as 2293. (Star Trek Generations artwork)

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