Black Holes

   Not all neutron stars become supernovae. If the star has a sufficiently large mass, the collapse of a star will continue to own and neutrons begin to fall inward until its radius becomes smaller Shvartsshildovskogo. After this star becomes a black hole.

   The existence of black holes was predicted by general relativity theory. According to this theory, matter and information can not leave a black hole in any way. Nevertheless, quantum mechanics, perhaps, makes it possible exceptions to this rule.

   There remains a number of open questions. Chief among them: Does the black hole in general? Indeed, to say exactly what this object - this is a black hole, its horizon is necessary to observe the events that it is impossible to determine. Nevertheless, as some astrophysical phenomena can not be explained without the involvement of accretion, and accretion to the facility without a solid surface, the existence of black holes is considered to be basically established.

   Also, open questions: Is it the collapse of a star into a black hole directly, bypassing the supernova? Are supernovae, which have subsequently become black holes? What is the exact effect of the initial mass of stars on the formation of objects at the end of its life cycle?