Space World (sometimes referenced as Spaceworld) was a large space station under the control of the System. It was located at astro point 781 in the 12th Sector
The vast external appearance was impressive to the Liberator crew with Jenna stating that she "never seen a space station on that design before" and Blake responding, "that's more than just a station".
It was the central control complex for three planets previously at war but now united by the System, and probably housed the System itself. Disruption to the System by Orac led to Space World suffering damage of unspecified extent on Liberator's departure, and the whole space station itself may have been destroyed. (TV: Redemption)