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Ron,
This is very interesting. I have often wondered about these and have watched the History Channel several times when these shows come on.
I do understand the "theory" but I just can't imagine them having so much gravity that even light cannot escape. I suppose if light cannot escape then there would be no use in sending, say a satellite into one and let it send out images. At least it would send images until it got too deep into the mass.
Makes you wonder what is on the other side.
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