Question: Star Wars: The Roleplaying Game is a role-playing game set in the "Star Wars" universe, written and published by West End Games (WEG) between 1987 and 1999, the game system was slightly modified and rereleased in 2004 as which generic science fiction role-playing game (RPG), based on the "D6 System"?
Context: The Star Wars Roleplaying Game is a d20 System roleplaying game set in the "Star Wars" universe.  The game was written by Bill Slavicsek, Andy Collins and JD Wiker and published by Wizards of the Coast in late 2000 and revised in 2002.  In 2007, Wizards released the "Saga Edition" of the game, which made major changes in an effort to streamline the rules system. Star Wars MUSH (commonly referred to as SW1) is a text-based online role-playing game.  "Star Wars MUSH" was created in May 1991 and was released to the public in January 1992.  The game predates the majority of ""Star Wars" expanded universe" and as such largely deviates from the established "Star Wars" universe set after "Return of the Jedi".  The game scenario system is based on the discontinued West End Games' .  The game persisted throughout the '90s as one of the net's more successful "Star Wars"-themed MUSHes, earning a feature in "The Incredible Internet Guide to Star Wars". The D6 System is a role-playing game system published by West End Games (WEG) and licensees.  While the system is primarily intended for pen-and-paper role-playing games, variations of the system have also been used in live action role-playing games and miniature battle games.  The system is named after the 6-sided die, which is used in every roll required by the system. D6 Adventure is a generic role-playing game system based on the D6 System.  "D6 Adventure" is published as a stand-alone rulebook (not dependent upon or requiring any other D6 System rulebooks) and is supported by its own line of supplements. The Star Wars Adventure Journal was a publication distributed by West End Games between 1994 and 1997.  Fifteen issues were printed, containing short stories set in the "Star Wars" expanded universe by both well-known and relatively unknown Star Wars authors; adventures and source material for the West End Games version of the ; "Galaxywide NewsNets" were fictional news reports from throughout the galaxy; interviews with personalities from all walks of Star Wars literature; and reviews of new and upcoming Star Wars products. Star Wars: The Roleplaying Game is a role-playing game set in the "Star Wars" universe, written and published by West End Games (WEG) between 1987 and 1999.  The game system was slightly modified and rereleased in 2004 as "D6 Space", which used a generic space opera setting.  An unrelated "Star Wars" RPG was published by Wizards of the Coast from 2000 to 2010.  Since 2012 the official "Star Wars" role-playing game is another unrelated game, published by Fantasy Flight Games. The Star Wars Roleplaying Game is a tabletop role-playing game set in the "Star Wars" universe first published by Fantasy Flight Games in August 2012.  It consists of three different standalone games, each one conceived to play a particular type of character: Star Wars Miniatures is a 34mm scale collectible miniatures tabletop game based on the "Star Wars" fictional universe that was produced by Wizards of the Coast.  The game was originally released in September 2004 and continued production until May 2010.  "Star Wars Miniatures" players build point-based squads from one of ten different in-universe factions then conduct battles between those squads.  The game mechanics are a simplified version of the d20 roleplaying game system.  Multiple maps, scenarios, and set themes from different settings and time periods from within the Star Wars universe are available. The Star Trek Roleplaying Game is a role-playing game (RPG) set in the "Star Trek" universe using the "CODA System" rules and first published by Decipher, Inc. in 2002.  When Decipher acquired the rights to create the RPG, they also acquired most of the gaming studio from Last Unicorn Games.  However, the Decipher game system is dissimilar to .  Instead, the system is similar to Wizards of the Coast's "d20 System" but uses 2D6 to resolve actions. D6 Space is a generic science fiction role-playing game (RPG) based on the "D6 System".  Although derived, in part, from material originally presented in "The Star Wars Roleplaying Game", "D6 Space" is published as a stand-alone rulebook (not dependent upon or requiring other D6 System or Star Wars rulebooks) and is supported by its own line of supplements.
Answer: D6 Space