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Retcon article
(covers information that was retroactively changed)

A retrorocket was a piece of advanced propulsion technology aboard NASA's Ranger 5 space probe when it was launched in the mid-20th century.

A schematic of the Ranger 5 spacecraft depicting the location of the retrorocket was stored in the USS Enterprise's library computer database. This database was accessed by the Talosians in 2254. (TOS: "The Cage")

A schematic of the Ranger 5 spacecraft was from the archives of the National Aeronautics and Space Administration - Jet Propulsion Laboratory.

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