Deuterium

One of two primary fuels for the DT Vista Inertial Fusion Engine, along with Tritium. A small amount (15 units) is included with the fusion engine; more must be produced via centrifugation in a Science Lab. In order to produce deuterium, the Science Lab must be situated in either a body of liquid water or Jool's clouds (what altitude?). Deuterium can be stored in the Deuterium Tritium Tank.