A giant star that has reached the end of its life falls and forms neutron stars. This results into formation of neutrons that are compressed to make a dense ball around the star’s gravity. A neutron star has a mass about 1.4 times that of our Sun but is packed within a sphere only twenty kilometers in diameter.

When the massive stars come to an end in their life, they collapse with such force of gravity that the force of gravity is overwhelmed thereby forming black hole. This then leads to the star collapsing forming a singularity; a point space where the density is infinite and such curve of spacetime that nothing including the light can escape.

There are certain similarities between neutron stars and black holes but they are quite unlike any other things. Matter is composed of neutron stars while black hole does not consist any matter. As black holes do not have matters inside, they have got neither voids nor vacuum.

At a singularity inside a black hole, there is literally a point where all known physical law cease. There is no information about what goes on the interior of a black hole, only theories asserting that it is a point of infinite density and zero volume.

Among the most enigmatic objects of the cosmos, black holes remain as. They remain unknown in terms of their operation, inner mechanisms etc.
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