The core is almost inaccessible due to it's location but the Tikhio's knowledge of dark matter has enabled them to build stations centered around it to create energy from the supermassive black hole. The Solar Systems here house the oldest planets in all of Rhodikh and have planets with ancient ruins.
According to Tikhio study there are ruins of 5 different (extinct) species. 4 of organics and 1 of synthetics.
Most of the Reproduction Centers are positioned here as they can quickly receive the energy produced by the facilities around the Core itself.
The Dhrek Cloud is a small part that seems to be loose of Rhodikh, it houses many new and resource rich planets that are mined by the Tikhio.
The Aszer Region is home to old and new planets (dependant of how far you are from the Core Region) and house some species that have yet to invent spacefaring technology. The Tikhio do not make attempts to uplift them but are prepared to help them when they have reached space and are able to leave their own Solar System.
The Prenkhoor Region is where Kurto is situated and has the biggest concentration of Tikhio. Most of the planets here are exhausted (of resources) and colonised, about 4,7% of all planets here house life but none seem to be showing signs of true evolution, a fact the Tikhio find disappointing as they wished to study this.
The Illyu Cloud is the most recent part of Rhodikh (and just as the Dhrek Cloud seems to be loose of Rhodikh) and the Tikhio use it for study about life and dark energy. Most planets cannot be settled ot mined yet so this is mostly an unclaimed region. The Tikhio are debating for some while whether or not they should keep this for foreigners to use.