Stars will inevitably end up in one of two situations at the end of their life. They will expand and then eventually run out of fuel because all the hydrogen is burnt up and then turn into a black hole upon collapse. Or they will expand and eventually run out of fuel because all the hydrogen is burnt up and then turn into a small neutron start. Black holes form more often from larger stars, upon collapse.
The final stage of a small star’s life is that of dimming and cooling, and it becomes what is known as a White Dwarf. A massive star’s core collapses in its final stage, which causes an explosion, called Supernova. Sometimes the core can survive the explosion and either becomes a smaller Neutron Star o a Black Hole.
This depends. Some stars like our sun, will reach a red giant stage and later in its life when only the core is left will become a white dwarf and ultimately fade into a black dwarf. Other stars might not enter the red giant stage at all and instead cool down to become a white dwarf and than a black dwarf. For an intermediate mass-star, it ends its cycle of life as a black dwarf. And lastly, some will die in a big explosion called a supernovae. To read more about a star’s life cycles, visit the NASA link below.
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