The Chol Nebula was a relatively minor nebula that partially engulfed the Cholganna system in the Outer Rim Territories. The nebula consisted of mostly gases but contained some meteoroid or dust clouds which were dense enough to prevent sensor arrays or transmitters penetrating the area, making it especially dangerous to navigate. The nebula appeared to be a crimson red color to those who viewed it in space. The nebula slowly expanded, engulfing more of the Cholgana system as it did so. By the time of the Galactic Civil War between the Galactic Empire and the Alliance to Restore the Republic, the planet Cholganna passed through the nebula for approximately two thirds of its orbit of its star systems sun.