Task: Text Categorization
Input (English): These objects are thought to provide power to blazars. The rotating versions of these bodies described by the Kerr metric are surrounded by ergospheres from which energy can be gained in the Penrose process, and they can be described by mass, charge, and angular momentum according to the [*] no-hair theorem. They aren't neutron stars, but after exploding in supernovae, stars that have overcome the electron degeneracy pressure of the Chandrasekhar limit can form these objects. Featuring an event horizon at the Schwarzchild radius surrounding a gravitational singularity, for 10 points, name these astronomical objects so massive that no light can escape them.
Output (English): Science