Star Collapse: Why Not in Early Stages?

In summary, a star is able to resist collapsing in its early stages of life due to the energy produced by fusion reactions. As it ages and uses up its fuel, it eventually reaches a point where there is not enough energy to support it, leading to a collapse. Additionally, stars lose a small amount of mass throughout their lifetime, and even after using up its fuel, a star can continue to cycle between collapse and expansion for billions of years.
  • #1
bassplayer142
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Why doesn't a star collapse in the early stages of its life instead of the later. You would think that with less gas at the end stages gravity would weaken and not allow a black hole.
 
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  • #2
A star is held up by the energy (actaully radiation pressure) given off by the fusion reaction in the centre. A young star is mostly hydrogen which reacts rather well, as a star ages it uses up hydrogen in the core, then Helium, Carbon etc until it gets to a material that won't easily react. As there is no more energy it then collapses.
A star loses a negligible amount of it's mass through most of it's life - mostly charged particles in the solar wind. Remember the fuel that is used in the reaction doesn't get used up, it just converts to helium which stays in the star.
 
  • #3
Cepheid variables are a good example. They are relatively massive stars that cyclically collapse and expand. During the collapse phase, they reheat, and the reheating causes them to expand once again. This cycle can continue for billions of years.
 

1. What is a star collapse?

A star collapse is a process in which a star's core collapses under its own gravity, resulting in a violent explosion known as a supernova.

2. Why do stars collapse?

Stars collapse when they run out of fuel to sustain their nuclear fusion reactions. The core of the star then becomes unstable and collapses under its own gravity.

3. What are the early stages of a star collapse?

The early stages of a star collapse involve the core collapsing and becoming denser and hotter. This leads to the production of heavier elements and the release of a large amount of energy.

4. Why is it unlikely for a star to collapse in its early stages?

The energy released during the early stages of a star collapse is not enough to overcome the outward pressure of the star's radiation and keep the star from collapsing. Additionally, stars have a strong magnetic field that can prevent collapse in the early stages.

5. What happens after a star collapses?

After a star collapses, the intense pressure and heat can cause the star's outer layers to explode in a supernova, leaving behind a dense core known as a neutron star or black hole.

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