Your My Hy-Vee account provides access to your history, allows you to print records, submit multiple prescriptions at once and more. Learn more. This healthy lifestyle program emphasizes eating for good health, weight loss and being physically active. Beginâ¢ is not a âdietâ- Beginâ¢ is a plan to help with lifelong wellness.
Given sufficient temperature and pressure, 4 hydrogen nuclei fuse to produce helium, at the same time giving off energy in the form of heat and light and other forms of radiation. This means that stars, with a few exceptions such as super-massive stars, last for many billions of years.
That is to say if a protostar has at least 0.08 times the mass of our sun and has a temperature of at least 107 K, hydrogen fusion can begin in it and it will become a star. Hydrogen fusion is the longest stage in an active stars life and so is considered the main sequence of a star.1]. The other process through which hydrogen can fuse into helium in a star is called the carbon cycle. This process will occur if the star has carbon present with in it and if the stars temperature is 2x107 K or greater. Equations (6)-(11) outline the series of reactions that occur in the carbon cycle.