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Nannie Keeling

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What do very large mass star become at the end of their life cycle?

The most massive stars will die as black holes.


What is a star at the end of its life cycle that eventually becomes a black dwarf?

It's really hard to tell for an individual star whether it will become a black hole. That depends on the mass of the star that remains after it runs out of fuel. Please note that in a supernova explosion, a large portion of a star's mass can be blown off into space. However, in general it is the most massive stars that are most likely to become black holes. Moreover, a supergiant star is not only very massive, but it is also likely to run out of fuel in the near future - meaning, in the next few million years - and therefore collapse (perhaps into a black hole, perhaps into a neutron star).


What determines how large a star gets?

The mass of a star primarily determines its size. Stars with greater mass will be larger, as there is a balance between internal pressure from nuclear fusion and gravity pulling the star inward. Higher mass stars have more fusion reactions occurring in their cores, creating more pressure to counteract gravity and resulting in larger sizes.


A star that has collasped after using its fuel?

A star, after using all of it's fuel explodes. We call this a super nova, and after this the star will either become a black dwarf star (or maybe a white dwarf) or it will collapse in on its self creating a black hole.


Why is it rare for a star to become a black hole when it dies?

Because it takes a large amount of mass for the star to end up that way. Most stars will become white dwarfs. A small fraction will become neutron stars. And even smaller fraction will become black holes.