Light just now reaching us from Andromeda Galaxy was created literally millions of years ago, around 2.5 to be in the ballpark. When you look at a star, you're literally looking at the past. That means tonight, when we look up, The light that lets us see Andromeda was created when the genus Homo first appeared here on Earth. Is it possible that Andromenda, or any other star for that matter, could be dead and gone, but we don't know about it because the light hasn't traveled far enough yet? Like for example, if Andromeda just suddenly died today, would we know about it? Or would we not find out until 2.5 million years from now and suddenly realize we can't see it anymore Hopefully I'm phrasing my question correctly.