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The Great Barrier is an immense energy field surrounding the galactic core of the Milky Way Galaxy. It was created 500,000 years ago by the Q Continuum to imprison The One for its crimes. (TNG - The Q Continuum novel: Q-Strike)
The Federation starship USS Enterprise first crossed the barrier into the center of the galaxy in the late 2260s. In the center of the galaxy, they were pulled into the alternate world called Megas-Tu. (TAS episode & Log Three novelization: The Magicks of Megas-Tu)
In 2287, Sybok (having been influenced by The One) commandeered the USS Enterprise-A and successfully took it through the Great Barrier in search of Sha Ka Ree. (TOS movie, novelization & comic adaptation: The Final Frontier)
|Stars, systems and objects of the Sagittarius constellation|
|Great Barrier • Lambda Sagittarii (Kaus Borealis, 22 Sgr, Chalna) • M23 Cluster • Omega Sagittarii • V1216 Sagitarii (Ross 154) • Sagittarius Dwarf Galaxy • Zeta Sagittarii (Ascella)|