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" ... But hard science fiction writers are nothing if not persistent. The original wormhole ideas looked at the simplest type of black holes known as the Schwarzchild metric. These are black holes that are in a vacuum and don't rotate. Real black holes rotate. If Schwarzchild black holes can't be wormholes, perhaps rotating ones can. In 1963 Roy Kerr found a solution to general relativity for a rotating black hole. This Kerr metric, as it came to be known, has some interesting properties. For one it twists space around it, a property known as frame dragging. Any spaceship near a rotating black hole could use frame dragging to get a big burst of speed. For another, Kerr black holes have a different kind of interior than a Schwarzchild black hole. If a black hole isn't rotating, all of its matter is forced to compress into a single infinitesimal point known as a singularity. Anything that enters the black hole can't avoid falling into that singularity, so if your spaceship goes into the black hole it will be crushed. A rotating black hole also contains a singularity, but because of its rotation it forms as a ring rathter than a point. And things aren't forced to collapse into the ring singularity. It's possible for your spaceship to enter a rotating black hole and avoid being crushed by the singularity. Of course, according to standard physics you'd still be trapped forever by the black hole. ... "