A black hole is formed when a star, 2.5 times the mass of our sun (stated as the Landau-oppenheimer-Volkou limit) run out of its hydrogen and other nuclear fuel, it gets cold and will shrink to an infinitely small point. Its gravity will then grow strong and suck everything into it, including light. If it is a star that ran out of fuel but does not have enough mass to become a black hole, it becomes a neutron star or white dwraf, which are dead stars.
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Howdid they know about the black hole? observations
Beam from black hole
History of black hole discovery
What caused a black hole?
Black Hole is an infinitely small point?
One that failed to become Black hole, becomes white dwraf or neutron star
Heating of particleswhen entering
