>What I was trying to say is this, if no light can escape from a black hole, the gravitational attraction or velocity of gravity (Vg) must be greater than the speed of light. Please note that the only observable emmissions from the vicinity of Black Holes is Hawkins radiation which is caused by the atoms being ripped apart, just prior to the event horizon. As the electrons are in a state greater than 7 electron volts they have sufficient energy to escape.

I never heard of a "speed of gravitation"; and it is confusing, at the least, to try to compare gravitational force (N/kg or m/sec^2) with a speed, like the light speed (m/sec).

The traditional explanation, for laymen, is that the escape velocity becomes greater than the speed of light; a ray of light will "fall back" into the black hole. According to a recent article in "Das Himmelsjahr", this explanation is innacurate, because light can never go slower (in a vacuum) than 300,000 km/sec; IOW, it won't gradually slow down, like a stone that you throw into the air, to later fall back. The real explanation is more confusing; somehow, within the event horizon, all space-time paths lead to the center of the black hole.

This is under the classical assumption that the black hole is not rotating; the math for a rotating black hole is more complicated, and has only been solved in recent years.


I don't know too many mathematical details about the Hawkings radiation, so I can't comment on this.

>The zone where this occurs is approx 100Kms from the event horizon and has also been observed.
>
>Anything that crosses the event horizon never returns, including photons.