Stars spend about ninety% in their lifetimes fusing hydrogen into helium in superior-temperature-and-tension reactions of their cores. Such stars are stated to become on the primary sequence and therefore are referred to as dwarf stars. totally free!|This process releases energy that traverses the star's inside and radiates into outer House. https://conner961c6.uzblog.net/5-simple-statements-about-star-explained-41028910