When did aliens leave the public discourse? Right now there's a bit of a flare up, because that's how modern media works - some story is done, gets clicks, ever

When did aliens leave the public discourse? Right now there's a bit of a flare up, because that's how modern media works - some story is done, gets clicks, everyone rides the SEO trend for a while until something else crops up. I don't think there's much more to it than that.