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Ed ~ the obvious solution is that r is never equal to 0.
The smallest point of spacetime is 10^-42, and Heisenberg uncertainty principle dictates that this singularity is smeared over a finite area.
However an understanding of the physics still requires a new theory of quantum gravity to be formulated.

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Leading physicists attempt to answer the question: "What are black holes made of?"
Those questioned include Professors Andrew Strominger, Michio Kaku, Lawrence Krauss, Max Tegmark, Ramesh Narayan and Douglas Leonard.

Horizon: Who is afraid of a big black hole was on BBC Two at 21:00 BST on Tuesday 3 November. Watch repeat with BBC iPlayer.


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