Star Wars Galaxies was a Star Wars themed massively multiplayer online role-playing game (MMORPG) for Microsoft Windows, developed by Sony Online Entertainment and published by LucasArts.
The game launched with 10 planets: Tatooine, Naboo, Corellia, Talus, Rori, Dantooine, Lok, Yavin IV, the forest moon of Endor, and Dathomir. In the second expansion, Rage of the Wookiees, the Wookiee home planet Kashyyyk was added. In the third expansion, Trials of Obi-Wan, the planet Mustafar was added. Each of the original 10 planets are represented by approximately 225 square kilometers (15 km x 15 km maps) of game space. In contrast, the expansion planets of Kashyyyk and Mustafar are smaller, constructed differently (e.g. instances) and in some cases imposed different rules than the original, such as terrain that is not traversable (i.e. mountains or hills that cannot be climbed over). In addition to the 12 planets, there are 12 space zones, each encompassing approximately 3400 cubic kilometers (15 km cubes) of fully navigable space. Nine of them are associated with one or more of the playable planets: Tattoo (Tatooine), Naboo (Naboo and Rori), Corellia (Corellia and Talus), Dantooine, Karthakk (Lok), Yavin, Endor, Dathomir, and Kashyyyk. (Mustafar has no associated space zone.) Kessel and Deep Space have no planets and are used for high-level gameplay and player-versus-player combat. The Ord Mantell sector was released in January 2008 as a new space-only zone, though there is a space station there (called Nova Orion) where pilots can land and acquire quests. The planet Hoth was added in November 2008 as part of an instance, but could only be explored during the events of the Battle of Echo Base.