Retcon article(covers information that was retroactively changed)
The Orbiting Solar Observatory, or OSO, was a 20th century series of artificial satellites used by NASA for studying the physical properties of the Sun.
A black-and-white drawing of the satellite was stored in the USS Enterprise library computer. This drawing was retrieved by the Talosians when they accessed the starship's computers in 2254. (TOS: "The Cage")
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