Earth Pre-Federation Database - Orbiting Solar Observatory

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"
Text from the Memory Alpha, the free Star Trek reference
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