Retcon article
(covers information that was retroactively changed)

An ion chamber was a piece of advanced sensor technology aboard NASA's Mariner 2 and Ranger Block I space probes when they were launched in the mid-20th century.

Schematics of the Mariner 2 and Ranger spacecraft depicting the location of the ion chamber were stored in the USS Enterprise's library computer database. This database was accessed by the Talosians in 2254. (TOS: "The Cage")

The schematics of the Mariner 2 and Ranger spacecraft were from the archives of the National Aeronautics and Space Administration - Jet Propulsion Laboratory.

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