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One of two things happens. One, it goes out, starts to contract because gravity is no longer balanced by radiation pressure, and rekindles as a HELIUM burning star (actually, it would be fusing that Helium into Carbon). Two, it just goes out and become a brown dwarf. The difference is how massive it is. The more massive, the more "lives" it can have as a star, but each one is shorter that the one before until it may spend less that a day making Iron and then go supernova.
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∙ 11y ago
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∙ 13y agoFusion, in general, is the joining of light atomic nuclei to form heavier ones. The simplest form of fusion is the fusing of hydrogen to form helium. This is done in most stars, and is their primary energy source.
The so-called proton-proton reaction results in an atomic nucleus (helium) that has less mass than the sum of its components. Some of the mass of the particles creating the new nucleus has been converted into nuclear binding energy or nuclear glue. This is necessary to offset the repulsive forces of the positive charges making up the nucleus. The residual strong force is at work here, and in stars, this process is one of those involved in stellar nucleosynthesis. Lots of energy is liberated as these reactions occur.
(see related question)
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∙ 14y agoMost stars, yes. Older stars that are moving into the Red Giant phase have helium fusion going on in the core, but that only happens during the last billion years or so of the star's life.
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∙ 14y agoHydrogen nuclei fuse (join) to form helium nuclei plus energy.
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∙ 11y agoour sun, and all of the stars its size.
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∙ 15y agoMost stars
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∙ 15y agoEnergy
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∙ 13y agoProtostar
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The energy source of stars is primarily associated with?
hydrogen fusion in the core. eventually runs out of hydrogen in the core and hydrogen fusion moves to the shell whilst the core contracts (star expands into red giant)...star leaves the main sequence.
When the core of a star shrinks after hydrogen fusion stops the core heats up but what happens to the star?
The rest of the star expands.
Where does hydrogen fusion occur when there is no hydrogen left in the core of a star?
If there is no hydrogen left at the core of star then hydrogen fusion cannot occur. What happens in the core of a star before that happens is that helium begins to fuse, and then the other elements going up the periodic table until carbon. And then if the star explodes into a supernova, traces of the higher elements are fused as well.
Explain how heavier elements are formed from hydrogen within the core of a star?
Nuclear fusion
What happens in the core that marks the birth of a star?
Nuclear fusion, converting hydrogen nuclei into helium nuclei.
Does hydrogen fusion occur in the corona?
No. Hydrogen fusion occurs in the star's core.
The energy source of stars is primarily associated with?
hydrogen fusion in the core. eventually runs out of hydrogen in the core and hydrogen fusion moves to the shell whilst the core contracts (star expands into red giant)...star leaves the main sequence.
When the core of a star shrinks after hydrogen fusion stops the core heats up but what happens to the star?
The rest of the star expands.
Why does a star's hydrogen supply run out?
The nuclear fusion in a star's core converts hydrogen into helium. Therefore the amount of hydrogen in a star is constantly decreasing.
What does a main sequence star do when it has exhausted its burnable hydrogen?
Hydrogen fusion continues in a shell surrounding the core. Eventually the core is compressed enough to start helium fusion.
Where does hydrogen fusion occur when there is no hydrogen left in the core of a star?
If there is no hydrogen left at the core of star then hydrogen fusion cannot occur. What happens in the core of a star before that happens is that helium begins to fuse, and then the other elements going up the periodic table until carbon. And then if the star explodes into a supernova, traces of the higher elements are fused as well.
How is nuclear fusion in a main-sequence star is different from nuclear fusion in a giant star.?
Nuclear Fusion in a Giant Star involves Helium being fused into a hydrogen shell that surrounds the core, and Nuclear Fusion in a Main-Sequence star involves Hydrogen being fused into Helium to produce Energy inside of the core.
How nuclear fusion in a main sequence is different from nuclear fusion in a giant star?
Nuclear Fusion in a Giant Star involves Helium being fused into a hydrogen shell that surrounds the core, and Nuclear Fusion in a Main-Sequence star involves Hydrogen being fused into Helium to produce Energy inside of the core.
What does helium have to do with a star?
Helium is formed in the core of the star (like the sun) by the nuclear fusion of hydrogen isotopes.
Explain how heavier elements are formed from hydrogen within the core of a star?
Nuclear fusion
How are heavier elements formed from hydrogen within the core of a star?
by the process of nuclear fusion
What creates the heat and light in a star?
Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.
