Gravitational singularities (black holes) are so massive that they literally warp space and time around them due to their gravity. When one approaches the speed of light, the passage of time slows down relative to the passage of time for someone traveling at non-relativistic speed. So if you had a pair of twins and sent one of them hurtling through space at near light-speed while the other stays on Earth. Time would seem to pass slower for the twin at light speed relative to the twin on earth. Conversely, time would seem to pass faster for the twin on Earth relative to the lightspeed twin. Gravitational singularities do basically the same thing, except with gravity instead of relativistic speed. It's all basic relativity! Science is awesome! Not the best example, and that is a gross simplification, but it gets the point across. Fun fact: the universal constant [i]c[/i], which denotes the speed of light, isn't actually about light at all. [i]c[/i] actually refers to the maximum speed at which information can travel which just so happens to be the speed light (photons) travels.