For 10 points, name this idea proposed by Roger Penrose which states that a black hole's event horizon will always prevent a spacetime singularity from being observed.
Shapiro and Teukolsky have explained a possible violation of this principle by simulating sufficiently large collisionless gas spheroids by seemingly observing the effects of the hoop conjecture. The strong version of this hypothesis states that generally asymptotically flat or compact initial data have maximal Cauchy development that are locally in-extendible; that version is equivalent to the hypothesis that spacetime is globally hyperbolic and was proposed after realizing that predictability fails in the (*) Kerr metric. Shahar Hod has refuted one challenge to this idea by noting that no amount of angular momentum added to a black hole would allow it to spin fast enough so that this principle would be violated. It was the subject of a famous bet between Kip Thorne and Stephen Hawking. For 10 points, name this idea proposed by Roger Penrose which states that a black hole's event horizon will always prevent a spacetime singularity from being observed.
Shapiro and Teukolsky have explained a possible violation of this principle by simulating sufficiently large collisionless gas spheroids by seemingly observing the effects of the hoop conjecture.
cosmic censorship principle