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>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).

On earth at sealevel we express gravity as being 9.8m/sec^2, this also assumes an absolute velocity, from very recent tests they are saying that this absolute velocity this approx 20 times the speed of light.

BTW dark energy is also being directly linked to gravity, I have my own views on how it works, and it seems to cover all existing string, m-theory & duality, I could expand on this now is not the time.

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>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.
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>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.

Yes it is negative rotation, it takes a bit to get the head around.

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>I don't know too many mathematical details about the Hawkings radiation, so I can't comment on this.
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>>The zone where this occurs is approx 100Kms from the event horizon and has also been observed.
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>>Anything that crosses the event horizon never returns, including photons.