Tau Alpha C, located in the Tau Ceti system, was the home of the humanoid species that The Traveler belonged to. (TNG: "Where No One Has Gone Before", "Conspiracy", "Journey's End") At warp 9.5, it would take 123 days to travel from Starbase 133 to Tau Alpha C. A subspace message would take days to travel back and forth between both locations. (TNG: "Remember Me")

The inhabitants of Tau Alpha C were capable of existing outside of time and dimensions, and had very little interest in associating with other more primitive species, until the 2360s, when they became aware of Humans like Wesley Crusher. The Traveler, a native, visited the USS Enterprise-D crew in 2364, and he and Wesley Crusher worked together. (TNG: "Where No One Has Gone Before")

In an alternate universe created after Doctor Beverly Crusher became trapped within a warp bubble, Wesley tried to contact Tau Alpha C for assistance when individuals began disappearing from the Enterprise, with only Dr. Crusher noticing. Ultimately, the entire universe, including Tau Alpha C, disappeared. (TNG: "Remember Me")

The location of Tau Ceti in "The Explored Galaxy" star chart

The location of Tau Ceti on a star chart

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