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 library computer. This drawing was retrieved by the Talosians when they accessed the starship's computers in 2254. ()
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fr:Programme Orbiting Solar Observatory
Category:Earth probes (retconned)