what is black hole? how it is formed?
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Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the star into space. Scientists think supermassive black holes were made at the same time as the galaxy they are in.
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A black hole is an end product of a supernova that takes place when a red giant(very big star) dies or can also be formed when two neutron stars(very small but the densest stars) collide. Black hole is basically a star with an escape velocity (speed needed to exit the gravitational sphere of an object) higher than the speed of light, i.e., 300000000 m/sec or 300000 km/sec
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