The Neutron Star system was a star system in the Mez'Dora Corridor, Section D. As its name implies, it's home to a neutron star -- an extremely compact star whose incredible mass produces intense gravity. The system is also home to the Ancient Station.
By riding the gravitational distortions of the neutron star, the Taburnackle was able to travel back in time by hundreds of thousands of years. In that era, the precursor to the neutron star was an ordinary star, which hadn't collapsed yet. The Ancient Station was outside the star then; by the present, it had been pulled into the star's body.