Stars spend about 90% of their lifetimes fusing hydrogen into helium in high-temperature-and-pressure reactions in their cores. This sort of stars are explained to generally be on the leading sequence and so are named dwarf stars. absolutely free!|This process releases energy that traverses the star's interior and radiates into outer https://travis406q2.blogsvila.com/26902987/5-simple-statements-about-star-explained