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Most black holes are formed when large stars collapse in on themselves or when an objects internal pressure is not enough to resist its own gravity. The collapse often causes a supernova: at the end of the life of a star 25 times the mass of our sun, it explodes. The outer part flies outward while the inner core collapses inward. If the mass is large enough, the core compresses in on itself, creating a stellar black hole. Supermassive black holes are believed have been formed at the same time as the galaxy they are in.
Black holes grow by absorbing additional matter with their gravitation pull. They accrete gas, interstellar dust, radiation, and even massive objects like stars or other black holes. Such large amounts of growth may have led to the creation of more supermassive black holes.
Black holes eventually die by process of Hawking Radiation. This theory expects that black holes shrink and evaporate over time as mass is lost. However, this would take a very long time, and it's predicted that everything in the universe will have disappeared before the last black star dies.
Black holes grow by absorbing additional matter with their gravitation pull. They accrete gas, interstellar dust, radiation, and even massive objects like stars or other black holes. Such large amounts of growth may have led to the creation of more supermassive black holes.
Black holes eventually die by process of Hawking Radiation. This theory expects that black holes shrink and evaporate over time as mass is lost. However, this would take a very long time, and it's predicted that everything in the universe will have disappeared before the last black star dies.