I'm not sure I understand why anyone would post "Black Holes are a Mystery" - Even Newtonian physics allowed for black holes (They knew the speed of light was finite, and they knew that potentially sufficient matter would have an escape velocity faster than light - so it was actually proposed before Einstein, the concept goes back to the late 1890's IIRC), and General relativity accounts for pretty much all their effects.
The only 'mystery' portion of black holes is that, as a singularity, we know they should be subject to quantum effects, and there is no quantum theory of gravity as of yet.
But the general concept of how they exist and interact outside the event horizon is hardly 'mysterious', and even internally behind the event horizon we have a 'pretty good' idea (Mathematically) of what's going on. The actual singularity where God divided by zero is beyond our mathematics as of yet, as is the prediction of the quantum effects, but by and large, we have a pretty strong grasp on the theory of a black hole structure.
Just sayin' - Jonnan
