Page last updated at 08:51 GMT, Tuesday, 3 November 2009

What are black holes made of?


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 is on BBC Two at 2100 BST on Tuesday 3 November or watch afterwards at BBC iPlayer .


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