Hyperspace exists just outside the realm of 'real' space and subspace. It is in essence, another dimension void of substance. Ship can be equipped with 'Hyperdrives' or Jump Engines in order enter hyperspace, or can enter Hyperspace via a Jump Gate and follow transponders to other jump gates. Ships in hyperspace can only be detected by other ships in hyperspace, and then only if they are in the same area. Traveling in Hyperspace is a lot faster than 'Real' Space.