When a star of the size three solar masses burns out its fuel it will become a neutron star or a white dwarf, where as a star with the size more than three soar masses burns its fuel it collapses and continues to fall on its become a black hole or a neutron star that is very highly dense.
Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Such an object packs three times or more the mass of the sun into a city-size range. This leads to a crazy amount of gravitational force pulling on objects round it. Black holes consume the dust and gas from the galaxy around them, growing in size.According the Harvard-Smithsonian Center for Astrophysics, "the Milky Way contains a few hundred million" stellar black holes.
Know more about black holes here
Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Such an object packs three times or more the mass of the sun into a city-size range. This leads to a crazy amount of gravitational force pulling on objects round it. Black holes consume the dust and gas from the galaxy around them, growing in size.According the Harvard-Smithsonian Center for Astrophysics, "the Milky Way contains a few hundred million" stellar black holes. Know more about black holes hereSupermassive Black Holes
In the heart of many spiral galaxies there are many black holes which are a million or even a billion times larger than the Sun.
Black Holes in the heart of the spiral galaxy are the main reason for birth of many stars at the early time of the galaxies, at that time during the birth of stars the black holes take in huge amount of dust clouds around it and after some time it glows brightly and this is called a Quasar.
After this happens it then gives birth o many stars.
Know More about Quasar here
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