Hi there. I've been watching some documentaries on the Big bang and the laws of nature. One particular interesting bit of information I gathered was on the effects of a black-hole on light and time. It was explained that the gravitational pull captures light, which is why there are completely black. Okay fine I understand that. They also said that the closer you get to the surface of a black hole, Time begins to slow down and eventually stop. I think I understand the idea, but they didn't explain why. All they said was that the laws of nature dictate that this happens. Why?