A star is a massive, luminous ball of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth.
Almost everything about a star is determined by its initial mass, including essential characteristics such as luminosity and size, as well as the star's evolution, lifespan, and eventual fate.
When stars form in the present Milky Way galaxy they are composed of about 71% hydrogen and 27% helium, as measured by mass, with a small fraction of heavier elements.
But a star life start when interactions occur in the nucleus, supporting the body hidrostásis and this remains luminous appearance. As part of these interactions are dilated in time, the outer parts of the object begin to merge their atoms. At a distance, the process stalls, to shrink back to the state in which external processes of melting and start over again is an increase of diameter. These interactions produce iridescence rates much lower, so the appearance is usually red. In this phase, the object enters the stage of collapse, so the force of gravity and the interactions of fusion in the outer layers of the object, produce a constant change in diameter, which just overcoming the gravitational forces on a moment in which the outer layers and elements have not merged.
You could say that the collapse process ends at the time that the star mergers produce material, and depending on the total mass of the star, fusion material degenerative process will enter its collapse to defeat the forces producing a supernova.
Is important to get questions all around us because "questions of science, science and progress". for this reason when you saw something always think what, why, how??
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