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answer:

A massive star collapses.  When it collapses it either beats out the forces of gravity or caves in.  If it beats gravity, it becomes a neutron star.  If it "loses to gravity" it will become a black hole.  Hope this helped

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Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings.