"Hundreds of years ago, the Tivan Group sent workers in to mine the organic matter within the skull. The bone, brain tissue, spinal fluid. All rare resources, highly valued in black markets across the galaxy. It's dangerous and illegal work, suitable only for outlaws."
Exitar is a mining space colony located inside the cosmic skull of Knowhere.
Birth of a Space Port
Hundred of years ago, the Tivan Group set up mining operation in the decapitated head of Celestial avatar known as Knowhere, in order to extract of precious organic matter for the black market. The business around the Celestial materials attracted a great amount of outlaws and criminals, giving birth to the space port of Exitar.
In 2014, the Guardians of the Galaxy arrived on Exitar with the intention to sell the Orb to Taneleer Tivan. Before being accepted by Tivan, the group spent some time at the Boot of Jemiah, where they had a nice time before a fight between Drax and Rocket led Drax away around the streets of the city. Meanwhile, the rest of the Guardians where recalled by Carina and meet with Tivan at its museum.
In the comics, "Exitar" is the hereditary title of a series of Celestials entitled with the destruction of species and planets that failed the cosmic projects of the race. The last Exitar was also known as Exitar the Exterminator.