In my quote above from the thread https://www.physicsforums.com/threads/ultimate-fate-of-the-universe.898640/I omitted consideration of dark matter because so very little is known about it. I am hoping someone here at the PF might be able to discuss the following questions. QUESTIONS Assume for the sake of simplicity in the context of this discussion, that some time in the very distant future all the matter in the universe which is not gravitationally part of the Milky Way has moved due the universe expansion to be too far away to gravitationally effect the Milky Way matter. For the reason discussed in the thread cited above (as well as the fact the baryonic matter interacts via photons in such a way that some of its gravitational potential energy is lost via photon radiation), all the Milky Way baryonic matter will after another very long period of time collapse into a single black hole. Since the dark matter does not lose gravitational potential energy via photon radiation, I am guessing that after all the baryonic matter is in a single black hole, a lot of the dark matter will remain outside this vary large black hole. 1. Is the correct? 2. If so, what is the fate of this outside dark matter? 3. What happens to the mass of the dark matter which had entered the black hole during the evaporation process? Which of the following possibilities do you think is more plausible? a. The Hawking radiation process turns this mass into photons. b. The Hawking radiation process turns this mass into some currently unknown zero mass particles which are of a type that is a constituent of dark matter. c. Something else happens.I am guessing that it is plausible that the dark matter may well will be captured by the black hole at a much slower rate than the black hole matter will escape due to Hawking radiation. If so, I think that this means that eventually the black hole will completely evaporate while there is still a lot of dark matter than never got into the black hole. 5. Is this plausibly correct?If so, I think this implies that at that time the universe contents will be just photons and dark matter? 6. is this correct? 7. If so, will the dark matter form another black hole? I will much appreciate any responses.