Stars are made primarily of the almond hydrogen the most common material universe. As a star forms, gravity pulls the hydrogen into a dense ball that heats up. Electrons are torn from the hydrogen and other atoms, creating a plasma made up primarily of protons (the nucleus of the hydrogen atom) and electrons. Normally, protons would repel each other. As matter accumulates ending the new star however, the protons move faster as the temperature increases. Eventually they acquire enough energy to come over the electrical repulsion between them. They start to fuse. The nuclear fusion process in the sun 's core does not take place all at once with four particles suddenly coming together …show more content…
This collapse subjects the stars atoms, primarily hydrogen to tremendous temperatures and pressures. The life of the star is a continuous struggle against this gravitational force. Stars that are burning hydrogen to produce energy are said to be main sequence stars. Large stars burn hotter and admit more energy, while smaller stars are cooler and Radiate less energy. Main-sequence stars are found any simple band-like pattern on a
Hertzsprung-Russell diagram, which graphs a stars energy output versus its temperature. When a star like the sun consumes most of its core hydrogen, a hydrogen rich central region remains. The star once again begins to collapse under gravity, and internal temperature is rise again. Hydrogen burning begins in shells outside the core while the cores helium may also combined in nuclear fusion reactions to form Carbon. These new nuclear processes may cause a star like the sun to expand briefly and become a red giant, a star is relatively cool outer layers glow red. Eventually however nuclear fuel must be exhausted. Gravity will dominate and the carbon rich star will collapse to a very small, very hot white