What is Black hole
The theory of the Black hole has been around for several decades and it has its proponents and others who are not so convinced about it. The black hole is an area in space where nothing can escape not even light. This is developed by the rule of general relativity that argues that compacted mass deforms the space time thus forming a hole. The black hole has a surface area that contains horizon known as event horizon which has a point of no return. This space time is called black because all light that is directed to it is absorbed once it hits the horizon of no return and hence none is reflected just like a black object would not reflect any light in normal circumstances.
This theory which propagates that some objects have gravity fields that are too strong for light to escape began to take shape in the 18 century though then it was not very popular. In the 19 century Karl Schwarzschild gave the theory a more modern approach; however the theory remained unappreciated for about four decades. During this period a lot of research went in to proofing that such a theory a possibility existed with many scientist using mathematical formulas to prove that a space-time existed where nothing could not escape. Huge black holes are expected when the big stars collapse at the end of their lifecycle. Black holes get bigger by absorbing mass from their surroundings such as other stars and merging with other black holes to form massive black holes in the process.
A theory that argues for black holes known as the no-hair theorem argues that once a black hole achieves a stable condition it contains certain properties which are mass, charge and angular momentum. Black holes that have the same properties and values or parameters are indistinguishable according to the quantum mechanics. The properties can be visible from without the black hole such as the ability of repelling other charges which is similar to what other charged objects do. Simple black holes contains no charge or angular momentum, there are named after Schwarzschild because he is credited with their discovery in 1916.This means that the notion of black holes sucking all matter within their reach is only true near a big black hole and only close to its horizon otherwise away from the horizon the gravitational fields are similar to any other body which have the same mass.
The stars which collapse are also referred to as frozen stars because anyone observing the stars from outside would find that the surface of the star is frozen in time at the very moment it collapsed and entered in to the black hole radius. Once an object falls in to the black hole the shape of the object or its charge gets distributed along the horizon of the black hole, all these are lost to the outside observers. Eventually the black hole achieves a stable state of the with only with only three parameters, this means that information about the object can not escape as black holes give little information about what went in.