Nimbus 1
Nimbus 1 was an American Nimbus Program weather satellite that was in service with NASA in the mid-20th century. This satellite was equipped with high-resolution cameras which were used to photograph the surface of the Earth. An image of the Nimbus 1 satellite in Earth's polar orbit was stored in the library computer of the . This image was later retrieved by the Talosians during their survey of the library computer's contents in 2254. 

The Nimbus 1 was equipped with several pieces of advanced technology for the period, including: horizon scanners, control section, yaw control nozzles, gas tank and cover, solar platforms, infrared scanner, cameras, and thermal control van. ()

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Earth probes (retconned)