The event horizon is only dependent on the mass of the black hole. For a black hole with zero spin (for simplicity's sake) you can use the equation I posted before (not sure what post it was though). If you use the rubber sheet visualization, the event horizon is where the slope of space-time becomes so great that light cannot climb up the edge of the black hole, and is turned back towards it.
The amount of mass the star when it goes supernova sets the distance the event horizon is from the singularity (called the Schwarzchild Radius). If a black hole were to acumulate more mass, the Schwarzchild Radius would increase.
The Schwarzchild Radius is not the radius of the old star - it is much, much smaller. This is because you need a lot of mass in a small area to create a black hole (One of the big schticks about black holes is a finite volume, finite mass, infinite - or realllllllllly really high density).
Hope I answered your question, good luck

• Re: Re: Question about Event Horizon! - silverana - November 20, 2000 - 10:17 UTC
  • Re: Re: Re: Question about Event Horizon! - bladesinger - November 20, 2000 - 14:50 UTC