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who? who moved the black hole? there is not an answer to that who. in fact, if **you** **take** *einstein's* **equation** **--** charlie: there is no idea what a blackhole is? neil: it is a region of space where matter has collapsed to such density that the gravity -- if matter collapses and gets denser, the surface gravity gets higher. it would be harder to escape. at some point, this collection of blob of matter has condensed so significantly that for you to escape, you would have to travel faster than the speed of light. that means light cannot escape. if light cannot escape, you are not getting out of this place. it is not only dark, but it is a whole -- hole. three-dimensional. blackhole. charlie: how long have we known about it? neil: dan stein -- einstein -- nine charlie: he was interested in them? neil: no. i asked stephen hawking over dinner went in at isaac newton make certain discoveries with his own mathematics that he invented? his response was, einstein did not come up with black holes. you cannot think up everything. [laughter] charlie: what else did you talk about at dinner? neil: th