Csilla / Legends Csilla , the homeworld of the Chiss , was a cold world of glaciers and snowy wastes located deep within Chiss Space , and served as the capital of the Chiss Ascendancy . Description . Csilla was a terrestrial planet in the Csilla system of the Unknown Regions of the galaxy , occupying the second orbit from the star Csilla and located at the junction of the Path of the Houses and the Vaagari Corridor . With standard gravity , a frigid climate , and a diameter of 11 , 080 kilometers , Csilla was orbited by three moons and had terrain featuring glaciers and caves . Due to the mineral content of the hydrosphere , glaciers on Csilla were a striking blue in color . A day on Csilla lasted 25 standard hours and a year lasted 462 local days . Chiss starships relied on a series of navigational anchor points that spread out from Csilla . Csilla was the capital of the Chiss Ascendancy and imported resources including foodstuffs , luxury goods , and technology from other Chiss colonies . A network of underground tube transports connected its largest city , Csaplar , to every other area on the planet , including other cities buried in the ice . Cities on Csilla were kept livable by heat from the interior of the planet . Csilla was also the center of Chiss politics ; their Cabinet and Parliament could be found at the House Palace in Csaplar . The Csapla Family was responsible for the distribution of resources to the populace of Csilla . History . Between 27 , 500 BBY and 27 , 000 BBY , Humans reached Csilla in sleeper ship s and colonized the planet . Genetic analysis indicated that these Humans developed into the Chiss , who quickly developed a global government . The need to manage Csilla ' s population and obtain resources without damaging their homeworld ' s ecosystem motivated the Chiss space program , which may have benefited from memories of the original colonization effort . The planet entered an ice age in 5000 BBY . Glaciers covered the normally - warm equatorial regions of the planet , while solid ice locked the poles in perpetual winter . In order to survive , the Chiss built energy - efficient warrens beneath the ice , as close to the warmth of the inner planet as possible , with underground carriage travel routes to connect the various underground sections of Csilla . The iceways were bored through the bedrock of the planet , so that they were unaffected by the shifting ice found on the planet ' s surface . Locked in an ice age for millennia , Csilla forced many socioeconomic and technological changes upon the Chiss , but few physical changes . Contrary to beliefs in a link between the Chiss skin color and the Csillan temperature , scientists concluded that the Chiss ’ blue skin was caused by a mineral found in the Csillan hydrosphere . During the Great Galactic War , negotiators from the Chiss Ascendancy — the Chiss ' government — and diplomats of the Sith Empire met in a summit , which resulted in the Ascendancy offering resources , tax revenues , and armies to the Empire in return for its sovereignty ; as part of the decision , no Imperials would enter Csilla without permission . It was also home to the Expeditionary Library . Grand Admiral Thrawn was born here . Inhabitants . Csilla was inhabited by eight billion sentients and was the homeworld of the Chiss , who comprised 99 % of the population . The Chiss were near - Human s whose blue skin color was partly caused by the mineral content of Csilla ' s hydrosphere . Behind the scenes . Csilla / ˈt͡ʃilːɒ / is a Hungarian female given name from csillag ( meaning " star " ) .