text: n internal type of this region named for Cauchy occurs when the Reissner–Nordström metric is applied to a charged type of body associated with this region.
full_question: n internal type of this region named for Cauchy occurs when the Reissner–Nordström metric is applied to a charged type of body associated with this region. In the Kerr metric, the ergosphere touches this region at the poles of a rotating type of body associated with this region. When pair production overlaps with this boundary, blackbody (*) radiation named for Hawking occurs. In a Penrose diagram, this region is represented by a line with slope c, and an observer will never see objects enter this region, instead observing an approaching object become increasingly redshifted and slow to a halt. Light emitted from within this boundary will never escape. For 10 points, name this “point of no return” that defines the boundary of a black hole.
first_sentence: n internal type of this region named for Cauchy occurs when the Reissner–Nordström metric is applied to a charged type of body associated with this region.