In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: The Bekenstein formula gives the entropy associated with one of these objects, whose thermodynamic processes inspired t'Hooft and Susskind to devise the holographic principle. Kruskal coordinates can be used to bridge the boundary associated with one type of these objects, and the inability to see the inside of one is known as the cosmic censorship hypothesis. These objects can only contain mass, angular momentum, and charge according to the no-hair theorem. Energy can be extracted from a rotating one via the Penrose process, and these objects can be described by the Reissner-Nordstrom or Kerr metrics, as well as the Schwarzchild metric. Surrounded by a boundary from beyond which an outside observer can receive no information, for ten points, identify these objects which may emit Hawking radiation and are believed to contain singularities formed from the collapse of a whole bunch of mass.
A:
Science