Born from a stellar cloud that collapsed with the molecular hydrogen as the main components, including other elements heavier than helium. When a stellar core, very thick enough. Some of the hydrogen is converted to helium through a continuous nuclear fission. In the rest of the stellar core, leaving the power to put through the process of radiation and convection. The internal pressure of the stellar prevent it from collapse following its own gravity. When the hydrogen fuel at the core, all of which are mass stellar at least 0.4 times the Sun will swell out until it becomes red giant stars, which, in some cases, these stars are harder than hard core element fusion, or in the shell around the star's core, red giant stars then it will evolve into a pattern is to recycle some of the substances into the matter between stars. These substances will cause the new version, which stars are the ratio of the higher heavy element.
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