I am asking this question because I found it in a lecture by Stephen Wolfram which you can see at this link at about 54:10: Apparently the question cannot be answered with current methods of physics- Wolfram describes it as "undecidable". But what is the question? When he says "escape" does he mean escape velocity? Does he mean that it is impossible to determine the escape velocity of a body in a three body problem? Or is it something else? Thanks.