Well, the closest potentially habitable planets outside the solar system are lightyears away. Even if we master space travel, I don't see a reason why at least

Well, the closest potentially habitable planets outside the solar system are lightyears away. Even if we master space travel, I don't see a reason why at least some humans wouldn't stay on Earth, unless it becomes truly uninhabitable. Of course this is speculation about the far future and technologies that don't yet exist, so it's hard to predict what would be likely in that scenario. >If "we" are here, or "something else" arrives at that time they are likely so advanced that the topic of communicating nuclear risks to them is rather pointless. I can think of at least two scenarios where that's not true: (1) human civilization collapses between now and then, and (2) humans go extinct and intelligence evolves in some other species. I'm sure there are other possibilities as well.