Since as Alexander points out, photons always have a local velocity of c, then the black hole event horizon where light cannot escape must occur because space is being absorbed by the black hole at the speed oflight at the event horizon. That is logical. But often simple logic does not work in exotic scenarios.

Does anyone know for sure what the speed of space is at the event horizon, and how does that correlate with the GR black hole solution that time goes from imaginary to real across the horizon. Time is the real radial spatial coordinate inside the event horizon in the GR black hole solution.

• differences - egauldin - July 8, 2001 - 22:48 UTC
• Speed of Space - smartguy - July 24, 2001 - 21:50 UTC