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From Memory Alpha, the free Star Trek reference
Thomsworld is a planet in or near the boundaries of the Federation.
In 2328, the Thomsworld Spaceport was a frequent stop of transport ships. This information was part of a commercial passenger manifest database recorded in Federation records reviewed by Data in 2370. (TNG: "Inheritance")
This planet only appeared mentioned in an okudagram on a viewscreen visible in freeze frame.
It is named for special effects artist Wil Thoms.