No question is unsolvable in all conceivable circumstances.
If a question cannot be answered then one simply does not have all the information required. With our current understanding of the laws of physics it is impossible for us to even present a factual answer to this question. We as of yet, Have not gained enough information. We can theorise. In theory it is both possible and impossible to reverse entropy. It is indeed possible that the answer cannot be truly answered unless information is collected over hundreds of billions of years and then is only analysed after there is no more information to be gained such as how the Cosmic AC done it in the Last Question to which this is reference
