Fun Facts about black holes. Black holes can have the mass of several million suns. They don't live forever, but slowly evaporate returning their energy to the universe. The center of a black hole, where all its mass resides, is a point called a singularity. Black holes differ from each other in mass and their spin. The information paradox has arisen when Hawking wrote down his theory for radiating black holes. Because of the radiation process of the black hole, the previously pure state of the matter inside the black hole interior. There is a striking convergence of interest in quantum entanglement, from the black hole information problem, from Ryu and Takayanagi's holographic entanglement entropy [12] (where it relates spacetime geometry to the dual eld theory), from condensed matter physics A black hole is formed when a large star starts running out of fuel and begins to collapse under its own gravity. Such a star may become a white dwarf or a neutron star, but if the star is sufficiently massive then it may continue shrinking eventually to the size of a tiny atom, known as a gravitational singularity. x Black Holes, Information, and the String Theory Revolution assumed: 1) The formation and evaporation of a black hole is consistent with the basic principles of quantum mechanics.In particular, this means that observations performed by observers who remain outside the black hole can be described by a unitary time evolution.The global process, Black holes may answer questions about the beginning and the future of the universe. Black holes may answer questions about the beginning and the future of the universe. reproduce the entropy of all black holes, but this argument does not reproduce the entropy exactly. Recently a precise calculation of the entropy of a neutral black hole in string theory was achieved (Emparan and GH, 2006). This was not for a four dimensional black hole, but a rotating five dimensional black hole in Kaluza-Klein theory. contain supermassive black holes,there are far too few of them - only about 10% of all galaxies are active - to account for all the black holes that once powered the quasars.By the early 1990s, astronomers were faced with the pros-pect that supermassive black holes might be located at the centre of every galaxy, making them as fundamental a 12 Physics-bending Facts about Black Holes When a large star runs out of fuel it may collapse into a black hole. All black holes start out small then grow in size as they consume matter from Black holes are the strangest objects in the Universe. A black hole does not have a surface, like a planet or star. Instead, it is a region of space where matter has collapsed in on itself. This catastrophic collapse results in a huge amount of mass being concentrated in an incredibly small area. 7 weird facts about black holes. Prepare to be wowed by the mysterious cosmic wonders that are black holes. Join our newsletter list. Go Email is required Want to know more? Newsletters. However, the information whose absence is quanti?ed by the Bekenstein-Hawking entropy is not irretrievably lost. It is located on the horizon of the black hole, probably in the form of stranded strings (see below for a de?nition), and will be radiated into the original asymptotic region as the black hole evaporates. 1.1. Some Classical Facts However, the information whose absence is quanti?ed by the Bekenstein-Hawking entropy is not irretrievably lost. It is located on the horizon of the black hole, probably i