Quote:
Originally Posted by Dowly
From what I've read and seen on documentaries, Black Hole isn't black. Only the very center is black, the outer edges are quite colorful not to mention the stream of particles it's shooting out (check the pic on previous page by Vendor).
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Dowly is on the right track, while the black hole is consuming matter its visible by the effect it is having on said matter. If it is consuming no matter than it becomes invisible to the eye once again, although you could still detect (in theory) it's gravitational distortion by gravity lensing a star behind the black hole (basically the star's light bends around the black hole so you can see it.)
Detecting them from their Hawking Radiation is another possibility although I'm not sure if that has yet been accomplished.
