Threshold is a planet in the Soell star system. It is an immense gas giant with a radius of 107,302 km (66,674.5 miles), and one natural satellite, Basis which has a radius of 11,924 kilometers. The atmosphere is made up of white Ammonia clouds, amber-colored Ammonium Hydrosulfide clouds, Phosphorus compounds, ice crystals and other gases. Threshold is known to have storms in its atmosphere similar to the storms that occur on the planet Jupiter. Basis, Fortress Ring World (Installation 04)