Core Heat
Core Heat
At some point in our Sun’s life its core will heat up & ignite fusion in the surrounding hydrogen layers. How?
At some point in our Sun’s life its core will heat up & ignite fusion in the surrounding hydrogen layers. How will that affect the stability of the Sun’s outer layers
please answer this as soon as possible.
At present the Sun is in a stable state, where it produces energy, by fusioning Hydrogen into Helium in its core. The "burning" of Hydrogen produces a counter pressure to gravity, so that the star is in equilibrium.
This socalled Main sequence stage will last 10 billion years for the Sun. Over this time the Sun evolves very slowly as it consumes Hydrogen in its core. It grows slightly larger, gets a bit brighter and hotter.
When most of the Hydrogen fuel in the core has been used, fusion stops. The inert Helium ash that has built up in the core starts to collapse under its own weight. This causes the core to heat up and to ignite the Hydrogen in a thin shell around the core. The Sun grows slowly and becomes first a Yellow Subgiant and then a Red Giant.
In the giant stage our Sun will expand to the size of the orbit of the Earth.
Inside the collapsing core the temperature is now high enough so that heavier elements can be made. During this stage Helium will fuse into Carbon and a little bit of Oxygen. When the star runs out of this type of fuel, it has neared the end of its life.
At that time the Sun begins to throw off layers because it can't support them anymore. This is called a planetary nebula. The core of the star becomes a white dwarf. This is an extremely dense star the size of a planet. Finally, when the white dwarf has used all its energy, it stops shining and becomes a "black dwarf", a dead star. This is expected to be the final state of our Sun.
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