Spiral galaxy

by Steven Dorsher

Many Nerds already have some familiarity with special relativity, which says that nothing can travel faster than the speed of light and that space and time coordinates depend on the speed of the person who observes them. Many Nerds also have some familiarity with black holes, which can either be the remnants of stars or much larger and found at the centers of galaxies. They are so massive they don’t allow light, or anything else, to leave, within the Schwarzschild radius. But what new properties does a spinning black hole have? And how have we observed spinning black holes in nature?