More fascinating stuff (via Phil Plait of Bad Astronomy):
“To be clear, you are not actually seeing the black hole itself. That circular hole in the center of the ring is not the black hole, but really an effect of its gravity. It’s being called the “shadow” of the black hole, but I think of it more as its cloaking device: The gravity is bending the light from the material around it, sending it toward us, leaving a gap where the black hole itself is. Perhaps the best way to describe it is as the silhouette of the black hole’s gravity.”
We are truly living in the golden age of Astrophysics:
See also: A method to image black holes.