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The Galactic Core is the center of the Milky Way galaxy. The Precursors apparently departed aboard great, circular spaceships similar to the Mark II in this direction — the direction indicated by the Rainbow Worlds pattern. However, since the relationship between TrueSpace and HyperSpace coordinates is not a simple linear transformation, there may exist two galactic cores: the one based the galaxy's structure in TrueSpace, and another based on its structure in HyperSpace.