I find this question baffling. Eminent physicists can only theorise what is beyond the unverse. My own theory is that it does not end but meets up again somewhere, like a never ending sphere. There may be things about the laws of physics that we do not yet know. It will take a million, a billion years before we even get near to it. As I always say, mankind has to find ways of getting out of here before the sun dies in five billion years.