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Hydrogen is the original fuel that keeps a star "burning" by nuclear fusion.

No hydrogen and the star will die unless it can start use helium to produce energy.

The small mass "red dwarf" stars can't use helium, but more massive stars can.

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Q: Why is the depletion of hydrogen in the core of a star such an important event?
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Does the sun and the earth have a hydrogen core?

There's hydrogen at the core of the sun - that's the sun's main fuel - but earth's core is mostly iron and nickel.


What is in the suns core?

helium and hydrogen


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.


Does Jupiter have a dense core of hydrogen and helium?

No, it has a dense rocky core in the middle!!


How does the sun create energy it is core?

Nuclear Fusion from hydrogen in it core and helium


Does hydrogen fusion occur in the corona?

No. Hydrogen fusion occurs in the star's core.


When hydrogen fuses with hydrogen what new element does this produce?

When hydrogen is fused in the suns core Helium is produced.


What is the inner core of the sun made of?

hydrogen


What is in a star's core?

A star's core consists mostly of hydrogen. As the star ages, the amount of helium, carbon and other elements in the core increases as they are the result "ash" resulting from the consumption of the hydrogen fuel.


How is the red-giant formed?

A red giant forms when a star runs out of hydrogen fuel at its core and starts fusing hydrogen in a shell around the core the core. This causes the star to expand and cool.


Which planets have a metallic hydrogen core?

No known planet has a core of metallic hydrogen, but Jupiter and Saturn have layers of liquid metallic hydrogen surrounding their cores.


What type of stars are red giants?

These are stars that have exhausted their core's supply of hydrogen by switching to a thermonuclear fusion made of hydrogen in a shell that surrounds the core.