About the different types of black holes
A black hole, as we believe today, is characterazed by three magnitudes: mass, momentum and electric charge. The current science of astrophyics sugests the above theoritical models of four types of black holes:
1. Schwarzchild`s black hole
On 1916 the German physicist Karl Schwarzchild, due to the Einstein`s theory, managed to describe theoritical a black hole with spherical symmetry, which hadn`t momentum and electric charge, but had only mass. Such a black hole had the ability to deform the space and through the four dimmensional bridge of EinsteinRoser transfer and present by a white hole the matter that approach to another space and time of our universe.
But let`s see how an observer, who is far away, realizes a radian mass that approaches a black hole.
While the mass is effected by the gravitational field of the black hole its magnetic lines are shifted to the red range of the spectrum.
Finally, when the mass is too close to the hole, its magnetic lines will be shifted to very large wave lengths that will seemed to the observer like it disappeared! The only that will remain will be the gravitational effects.
While all these are seen by the far observer another one that moves with the mass will feel the gravity raising till the moment he/she will be in pieces!!! And as time passes he/she will be smaller pieces!!!! $:o)
2. Kerr`s black hole
The second type… on 1963… by Roy Kerr. The idea of Kerr was that a black hole has not only mass but also momentum. Due to momentum these holes have different horizon of events than Schwarzchild`s.
Scientists say that maybe these holes can produce energy… (!) …known us Penrose`s mechanism.
3. Reissner  Nordstrom `s black hole
Black holes of this type are electrical charged, but have no momentum. Unfortunately I known nothing more about them.
4. Kerr  Newman `s black hole
These holes are the geniralization of Kerr`s. They have both momentum and electric charge!
All those types are just theories… Nothing is observed. Unfortunatelly… The only we have to do is solving mathematical equations and explain their physical sense. Also sometimes imagination works out!
