What causes the mass of a star to collapse onto its core?

Answer 1

The loss of equilibrium, the nuclear fire goes out and gravity win the struggle.


Yours: Grumpy

Answer 2

As nuclear explosions occur at the core of a star or planet, the explosions use up the mass at the center of the star. When the core is used up or after an especially large explosion, the explosion has attempted to cause a vacuum to exist which gravity will not allow and the star's mass fills the vacuum so rapidly that the outer shell which contains the vacuum collapses, implodes, causing an explosion. In most planets as well as some stars, the mass surrounding the core is much denser and thicker and can fill the vacuum with out collapsing and the planet or star just grows cold. Its constant compression stops, its gravity is lost, it's atmosphere floats off into space, and the planet/star dies a peaceful death.

Answer 3

First, two words: Explosion and Implosion. Sorry I may not have the story exactly right since it has been a long time since I studied this in school, but oh well...
When a star can fuse atoms together there is an explosion. This blasts outward and determines the size of the star. Stars start when gravity has collected enough gas and dust from space that the pressure causes atoms to fuse together - boom! It takes more and more pressure to fuse larger and larger atoms together. Pretty soon, there is not enough pressure to fuse the atoms together and the explosion stops. The gravity pulls the star downward to the center. This is an implosion. If the star is small, that is the end of it. If it is larger, then the contraction might reach the pressure needed for another fusion reaction. Boom again!

This boom is called a nova, and the blast blows part of the star into space. The rest contracts into a small star.

If the star is large enough, the pressure can cause the star to explode again for a while, making large atoms like iron. But then it can not explode again and starts to contract. This time there is one last fusion of iron and Ka-Booom!! The star has a huge explosion called a super-nova. This is the source of heavy elements like gold and uranium. Some super nova were so bright that they could be seen in the daytime sky!

;-D There are beautiful pictures of nebula that are the result of star's nova and super nova. Take a look at the url.

Answer 4

Gravity...it's what makes the star run. Stars produce their energy by squeezing Hydrogen into Helium in nuclear fusion. The resulting atom of Helium weighs less than two atoms of Hydrogen...the extra mass is converted to energy.

The fusion process also produces heavier elements...Nitrogen, Oxygen, Carbon etc. and the heavier elements sink to the core. The fusion process also causes expansion thus balancing the gravitational forces at work in the system. When the star runs short on Hydrogen the fusion expansion no longer counteracts the pull of the core and the star collapses. It doesn't happen in an instant or all at once as the collapse also condenses the mass causing more fusion/expansion. Really massive stars collapse and explode violently causing a supernova spreading all of the heavier elements across the universe.

Answer 5

Wikipedia

Answer 6

when the star has no more fuel to give out heat, the temperature reduces drastically and as some of the mass starts drowning, the gravity increase and more and more mass starts coming close together. As the density of the star increases, more and more mass drowns into the star. If the gravity is too much, it becomes an indefinite process. As the volume decreases more heat and energy is liberated.

Answer 7

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Answer 8

Lack of nuclear fuel > when the star has nealy exhausted it's fuel it begins to collapse inward on itself . After the star collapses to it's limit it will begin to expand again and then it will nova or supernova . Not all collapsing stars form black holes .

Answer 9

It runs out of fuel to burn in its core, and so it can't generate energy to keep the gravity outside from pushing in. It just gives up, basically, and implodes.

Answer 10

I think it has something to do with the amount of hydrogen in the star. when the hydrogen runs out, it collapses into a black hole.