These are questions that have been kind of gnawing away in the back of my brain and I'm hoping someone here would be so kind as to answer them for me.
Is a black hole merely the mass at the center or does its boundary start at the event horizon? In other words is the event horizon technically a part of the black hole?
At what distance from the mass of a black hole does the event horizon start?
I searched the net but couldn't find any answers (at least none that I could understand). Please keep your answers simple; I have a passing familiarity with physics and astronmy but I'm still a man on the street as it were.
Also, are there any good books on black holes that don't require a heavy scientific background? I wander through the science section of the bookstore every now and again but I haven't found any books solely on black holes.
Much thanks in advance.