(took this from wookiepedia but organized it a bit for our uses)

Planet Name: Arkania
Planet Function: Mining/Trade

Government: Corporate meritocracy
Planet Type: Tundra
Terrain:
            Canyons
            Icy Mountains and Cliffs
            Tundra
Gravity: Standard
Atmosphere:  Type I (breathable)
Length of Day: 18 standard hours
Length of Year: 277 local days
Population: 250-300 billion
Official Language: Arkanian Language
Major Exports:
                    Diamonds
                    Raw material
                    Medical supplies
                    High technology
Major Imports: Luxury Goods
Major Cities:
                    Adascopolis (capital)
                    Novania
                    Trade City
                    Kanti
Points of Interest:
                            Arca Jeth's praxeum
                            Veeshas Tuwan
                            Adascopolis Financial Exchange
                            Arkania Command
                            Diamond mines
Native Species:
                        Arkanians
                        Offshoots
                        Arkanian jellyfish
Immigrated Species:
                            Yaka
                            Previously Sith


Arkania was the adopted homeworld of the Arkanian race. It was covered with tundra and rich in diamonds and other precious minerals, which the Arkanians mined to further their offworld connections and master their technology. Arkanian cities were designed to keep the cold out, and were mostly completely enclosed. Off-world visitors rarely had to deal with the frigid conditions of the planet.

The population was thought to be slowly built up until there was a population boom at one time. Many citizens were miners. The population was estimated to be around 250-300 billion people. An exact number was never specified.


History:


Arkania was originally a world in the ancient Sith Empire, during which time it was the site of a Sith library called Veeshas Tuwan, established c. 6,900 BBY. Sith Lords would experiment with dark side magic in concealed chambers, and as the library grew over thousands of years, it eventually became so large that no one could actually find for what they were looking for.

After the exile of Naga Sadow, the Jedi sent several Masters to Arkania to destroy Veeshas Tuwan, and so they did. After the library's demolition, Arkania remained unpopulated for some thousand years.


When the Jedi on Ossus heard of a possibly re-emerging Sith force, they sent Jedi Masters across the known galaxy to places strong in the dark side, and Master Arca Jeth was sent to Arkania. Jeth cleansed the world of the dark side as much as possible set up a Jedi Praxeum on the planet, where he would later train such Jedi as Ulic Qel-Droma, Cay Qel-Droma, and Tott Doneeta. Many of the near-Human people to which Jeth belonged came with him and settled on the world: they came to be known as Arkanians. A number of diamond mines were established on the world.

By the time of the Mandalorian Wars, Arkania remained largely populated by the original Arkanian species. "Genetic offshoots" like Camper and Jarael were unwelcome to say the least, and when those two visited Arkania in 3,963 BBY to find a cure for Camper's illness, they found themselves pursued by powerful forces bent on capturing Camper and retrieving an unknown secret that he held: Adascorp, the world's most powerful corporation, run by the House of Adasca.

Due to their high sensitivity to infrared light, Arkanians in the Jedi Civil War time period developed infrared "blinders" for when they traveled to worlds that were noticeably high in such emissions. This technology was adapted to filter out excessive amounts of any electromagnetic energies, thus preventing "ocular overload" in native Arkanians.


The Arkanians developed a bad reputation as mad scientists, though not entirely undeserved. Arkanian scientists genetically altered many races with the approval of the oppressive, tyrannical Arkanian Dominion, including the neighboring Yaka, many of whom settled Arkania. In response, in 50 BBY a group of scientists known as the Arkanian Renegades attempted a coup against the Dominion, the Arkanian Revolution. The Renegades tried to create the ultimate army, cybernetic warriors. The coup failed, resulting in a a brutal civil war, in which Mace Windu, Aqinos, and the Iron Knights participated on the side of the Dominion. The cybernetic warrior Gorm the Dissolver faced off against Mace. Jabba served as a middleman, delivering weapons from Dreddon to the Renegades. At least two of the Iron Knights were slain, the other Iron Knights (along with Aqinos) were excommunicated by the Jedi High Council but made High Marshals by the Supreme Chancellor. The Renegades were all executed and Jabba was stuck with a surplus of weapons. Some of the cyborg soldiers survived, most notably the bounty hunter Gorm the Dissolver.


Prior to the Clone Wars, Arkania was known as the location of dejarik tournaments.

Many Arkanians became Jedi, like Jeth. One such Jedi was Serifa Altunen. Disgusted by the Clone Wars, Altunen left the Jedi Order and returned to her homeworld 20 BBY, urging Arkania to remain neutral. Anakin Skywalker and Obi-Wan Kenobi failed to convince her to return to the Order.
Arkania was part of the Galactic Empire, but never joined the New Republic.

Arkanians:

The Arkanians were a Near-Human race which resided primarily on the planet of Arkania, though they were not indigenous to it.

Arkanians considered themselves the pinnacle of evolution, and as such many were distinctly arrogant. Arkanian scientists had been experts in genetic manipulation for millennia, and by the time of the Mandalorian Wars the species had been split into many sub-species, making it hard to determine exactly what was a baseline Arkanian. Most Arkanians could pass for Human, though the majority had pure white eyes and four clawed digits on each hand.

Arkanians were capable of seeing in infra-red light, and their eyes were sensitive to sources of extreme heat. This was helpful on their dark and frigid homeworld, but when traveling offworld, many were forced to wear blinders on planets with hotter, younger suns. It was also not unusual for an Arkanian to enhance themselves with internal or external cybernetics, or in some cases both. It was also standard practice for many of the Arkanians to undergo further genetic manipulation on their own bodies, enhancing themselves even further and better than lesser species.


Regarded as some of the greatest scientists in the galaxy, members either made some of the greatest advancements in medical science, or performed atrocities which surpassed even those of the Galactic Empire. The Arkanians saw the genetic betterment of their neighboring systems as their duty, though many of their experiments were unwelcome.

One of their earliest known endeavors was the creation of the Quermian species from the Xexto around 16,950 BBY. Though they abandoned their secret experiments, fearing legal action from the Galactic Republic, the Quermians resurfaced millennia later.

Centuries before the rise of the Galactic Empire, much criticism was leveled at the Arkanians for their experiments on the dim-witted Yaka. Though they dramatically increased the species intelligence of the Yaka with their cybernetic enhancements, they also removed all trace of emotion from the people. The controversy culminated in 50 BBY with the Arkanian Revolution. A group of renegade scientists on Arkania, disapproving of the systematic alteration of the Yaka, built an army of cyborg knights to overthrow the Arkanian Dominion, the dominant government. The rebels were defeated when the Jedi intervened in the war.


Offshoots:


Offshoots were a sub-species of the Arkanian race produced by the famed Arkanian scientists and genetic researchers. One particular sub-species were bred as workers for the famed Arkanian gem mines. These people had five-fingered hands and Human-like eyes—sometimes even pointed ears. Unfortunately, they were especially vulnerable to minor Arkanian illnesses. The offshoots were treated as second-class or non-citizens by the baseline Arkanians, and the question over what to do with them was termed the "offshoot question." Arkoh Adasca planned to use Adascorp's genetic engineering expertise to solve the problem in a generation. However, his grandfather attempted to exterminate the offshoots with a plague that ravaged those at old age.


Arkanian Jellyfish: Arkanian jellyfish were presumably boneless aquatic animals from Arkania.


Yaka:

The Yaka were a race of Near-Human cyborgs hailing from the Yaka system. Centuries before the rise of the Galactic Empire, the neighboring Arkanians, known for their genetic experiments, implanted the naturally dim-witted race with cybernetic implants. The Arkanians saw this effort as benefiting the brutes, while the galaxy at large questioned the ethical implications of such an act.

For better or worse, the alterations the Yaka received not only made them more intelligent, but also stripped them of all emotion.