>The event horizon is described as the
>altitude above the black hole at which the most energetic visible light
>is bent so much that it is trapped in orbit around the black hole.
Oddly, no, light orbiting a black hole is some distance beyond the
event horison. Scientific American had an interesting article on this
and some other peculiar near-hole physics a year or two back. At the
event horizon, light ends up in the hole no matter what direction it's
going.