| − | Carbon-Nitrogen-Oxygen Cycle (or "hot CNO cycle") occurs in stars more massive than the [[sun]] (>1.1 Solar masses). This cycle is the primary process which converts hydrogen into helium. <sup>12</sup>C serves as a catalyst, an ingredient which is necessary for the reaction but is not consumed. | + | '''Carbon-Nitrogen-Oxygen Cycle''' (or '''hot CNO cycle''') occurs in stars more massive than the [[sun]] (>1.1 Solar masses). This cycle is the primary process which converts hydrogen into helium. <sup><small>12</small></sup>C serves as a catalyst, an ingredient which is necessary for the reaction but is not consumed. |