Hyperspace is an alternative region of space co-existing with real space which may be entered using a specialized engine or other device. Hyperspace is absolutely critical to the way of life of the Twin Spirals, as it allows faster-than-light travel and communication. Ships can cross the Prime galaxy in a matter of a few months with a hyperspace engine, and communications moving through hyperspace reach their destinations almost instantaneously. Without the discovery and use of hyperspace, the civilizations the stellar nations built would not be possible.