I think at some point, almost certainly not in our lifetimes, we'll detect the spectroscopic signatures of a planet that has an atmospheric makeup that HAS to be from life, but with no detectable signs of any civilization. Just nonsentient life. And we may never be able to get there.
Speaking of our moon, the fact that it's roughly the same size as the sun as seen from earth and the fact that this is a complete coincidence blows my mind. Like there's no reason for that to be the case. Total eclipses like ours (where you can see the corona) are very rare.
Definitely possible. I've read that the projected end of our sun is a "black dwarf", and that our sun's generation of stars is so young that there currently aren't any known black dwarf stars anywhere in the universe.
I don't really subscribe to the theory, but I think the idea that alien races are all like "go to SPACE? Why the fuck would we do that?? It sucks up there!" is definitely the funniest solution to the Fermi paradox.
Sure, but if you're taking that tack it could feel anything. We could build an AI for love and forgiveness and it decides it's more fun to be a psychopath. The scenario has to be constrained to a sane, logical AI.