But they're *galaxies*... they've got millions of stars in them, and maybe a few intelligent civilizations that have created a whole bunch of their equivalent of TV episodes. There may be plenty of reliable sources out there for all of this, it's just that they're all published in the other galaxy and we have no way of accessing them or even knowing they exist.
If we have no way of knowing about it, it's irrelevant to the discussion. Let's stick to verifiable subjects, shall we? Our intended audience consists of humans, so the importance of a topic to humanity, rather than cosmic importance, is what's important.