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What is the core of a giant made out of after the helium has been depleted?
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What type of star burns helium?
All red giant stars will start helium fusion when their core is compressed.
What star in the life cycle of stars fuses hydrogen and helium?
A "red giant" star can fuse both hydrogen (in the star's outer shells) and helium (in the core).
What would happen to stars when they get old?
In the Sun's "old age" it will have no more hydrogen atoms to convert into helium atoms, which will cause the Sun to expand into a red giant start. The Sun will increase approximately 16 million times in size, expanding beyond and swallowing Mercury, Venus, Earth and possibly Mars.
Where and when was the helium in the sun form?
The Sun consists of 70% hydrogen, 28% helium and 2% heavier elements such as carbon. Helium is being formed in the core of the Sun every moment of time. It has a hydrogen core and forms helium by nuclear fusion. The Sun is a "main-sequence star which means it stops after all of the hydrogen has been fused into helium. The hydrogen molecules collide rapidly, which causes the heat on the Sun, by atomic fusion, ever heard of an H-bomb? the Sun is a giant H-bomb but every moment has billions of explosions, due to the tremendous pressure of the core. giving it the ability to have solar winds, and high heat and light emission. A different type of star such as red giants will continue to fuse, which is how they become so large. After the hydrogen has formed helium, the outermost shell is hydrogen burning, with a helium fusing core, then carbon is formed in the core, pushing helium to the array of shells, still leaving hydrogen as the outermost shell. After the maximum amount of fusion occurs, there is a dense molten iron core, with silicon, magnesium, neon, oxygen, carbon, helium, then a hydrogen burning shell. Thats an entire lesson for you!
Why don't red dwarfs become giant stars?
Because a red dwarf is mixed by convection, it can't develop an inert helium core surrounded by unprocessed hydrogen. Then it can never ignite a hydrogen shell and can't become a giant star.
What type of star burns helium?
All red giant stars will start helium fusion when their core is compressed.
What star in the life cycle of stars fuses hydrogen and helium?
A "red giant" star can fuse both hydrogen (in the star's outer shells) and helium (in the core).
Why doesnt the helium curently in the suns core under go fusion?
The Sun's core is not yet hot enough, or under enough pressure, for helium fusion. Which is probably just as well, since when helium fusion begins, the Sun will swell into a red giant which will incinerate the Earth.
What produces sun's energy?
Nuclear fusion of Hydrogen to Helium is what produces the Sun's Energy. this takes place in the core. Later when it becomes a Red Giant it will fuse Helium to Carbon
What event causes a star to change from a red giant to a horizontal branch star?
Stars leave the red giant branch when the temperature of the core reaches about 100 millionoK and helium fusion in the core begins. The star is now on the horizontal branch. In smaller stars - this is known as helium flash. [See related question]
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.
Do red giant stars have lithium in their cores?
some, but not much. the principle componant of a red giant's core is helium. lithium is not a product of stellar nuclear reactions, so any lithium in a star would have been there from when the gas cloud collapsed into a protostar.
What happens after a helium flash?
The luminosity of a low mass star goes down after helium flash. The sudden onset of helium fusion stops core shrinkage and the low-mass star will become smaller, and less luminous than it was as a red giant.
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.
The helium flash occurs at what stage in stellar evolution?
As a G-type star fuses its hydrogen to helium, this helium will gather in the core. As a result, the core will contract under its own weight as hydrogen is being spent. The contraction causes an increased hydrogen fusion rate, increasing the temperature. When insufficient hydrogen remains in the core, the layers above are no longer supported by the outward pressure of radiation, and collapse on top of the core, causing it to contract further, and also initiating hydrogen fusion outside the core. At this point, the star leaves the main sequence, and becomes a red giant. At this stage, the core of the giant may reach critical density for helium fusion to initiate. Since the core is composed of mostly degenerate matter at this stage, there is no regulation of the fusion rate. Also, degenerate matter is less opaque to the energies produced than non-degenerate matter, so conducts them better.Ehr, to summarize: the helium flash occurs during the red giant stage of G-type stars.
The fuel for fusion in the sun's core?
hydrogen atoms join to form helium. no hydrogen= red giant=white dwarf= DEAD
What is the process they generates energy into the core of the main sequence star?
Hydrogen fusion to make helium. When a star runs out of hydrogen in its core to fuse, it begins collapsing, leaves the main sequence, then ignites helium fusion to make carbon, becoming a red giant.
