"Contrary to most celestial bodies - which were discovered through observation - black holes saw the light when they did, as they are purely a product of the human mind. For quite a long time, they alone constituted this intruding and strange topic that was explored profoundly by theoreticians. Those individuals were only met with denial and rejection.
The main characteristic of black holes is that they present a convincing explanation for a range of physical and astronomical phenomena, wielding control over vast immense amounts of energy.
The book discusses this topic in the context of its relationship to a number of issues related to astronomical physics. It regards this matter as one of the most difficult problems in contemporary physics. "