Voidspace

Voidspace is a higher-dimensional, massless and colorless region that allows certain spaceships to travel at superluminal speeds. Spaceships outfitted for voidspace travel are known as "voidships", and the region gets its name for the colorless area that it appears as. Travel through voidspace requires extensive computing power from either a ship or controlling station, a superluminal drive capable of making a wormhole into voidspace, and enough fuel (typically Liquid Hydrogen, Tritium, Helium-3 or Lithium-7 Deuteride) to power the drive for each use.

The most advanced and commonplace drive, the Holtz-Zechiel (H-Z) Drive (colloquially known as a "Warp Drive"), involves both the ship/station's power grid and/or available fuel to "punch" a hole into voidspace, wide and tall enough for a ship to fit through. The more power/fuel allocated into the drive, the bigger the hole. The process itself isn't well understood, and is a closely guarded secret by governments, corporations, and the families of both Zechiel and Holtz.

History
Before its conception when the people of Eracustas took the void beyond the Sedaurus system, governments and corporations each sent their own generation ships to nearby stars from the 25th Century BCW. Research into superluminal travel will result in one of the discoveries being the dimension that would be later known as "voidspace". In 2238 BCW, the first Interstellar Gateway between two star systems was established utilizing a controlled wormhole into voidspace, connecting the Seduarus and Osiris systems. The trip between the two systems (about 3.02 lightyears) was shortened from 50 years to 2 hours. The gate was owned and operated by the United Nations of Eracustas, and later Eracustan Republic before newer drive technology made gateways obsolete. Gateways were constructed to network 12 systems by the end of the 20th century BCW.