Cairn

Cairn is a small terrestrial planet in the Junn System of the Atlas Sector. It is almost completely barren, with nothing but miles of brown rock and some craters, but evidence of civilization has been left behind by it's previous occupants; massive temples have been constructed in underground caverns, which scientists are ruthlessly researching, attempting to decipher the text left within them. It has been left uncolonized by the Sentinels due to scientific request, its small and unhospitable nature, and also out of some respect for its past owners.