Deep Core
a major stronghold of the Empire for decades, this area of the galaxy contained Byss. It was located between the Galactic Core (where the Core Worlds are located) and the very center of the known galaxy. It was the area of the galaxy with the greatest density of stars, and the intense gravitational mass of the Deep Core was thought to be impenetrable until Palpatine discovered a handful of safe hyperspace pathways. Throughout the era of the Old Republic, the Deep Core remained as mysterious as the Unknown Regions, and only a few brave explorers even bothered to try and penetrate its depths. At this center of the galaxy was a huge black hole, which made spaceflight - especially through hyperspace - extremely difficult. Many hyperspace lanes through the Deep Core were severely constricted pathways that led to dead-ends, since the density of gravity shadows was vastly greater than the rest of the galaxy. Once discovered, any hyperspace routes throught the Deep Core were jealously-guarded secrets, even after the Empire was defeated at Endor and relegated to the Imperial Remnant. Because the twisting pathways through the Deep Core were difficult to travel, Leia Organa Solo believed that they could be used to trap the Yuuzhan Vong fleet, if only the Imperial Remnant would allow the New Republic to have access to them. She offered Supreme Commander Gilad Pellaeon the Republic's complete intelligence on the Yuuzhan Vong in exchange for the knowledge of the Deep Core's hyperspace routes. Pellaeon gladly agreed, since the Deep Core was part of the New Republic anyway, and the knowledge of the hyperspace routes was essentially useless to the Imperial Remnant.