This 30 million light year thing is a bit confusing. It could be gone now and we would not know...right? In fact is there even any way to prove anything farther than let’s say a million light years is still there? This stuff kinda hurts my head.
That’s very true. Only the closest stars in our own Galaxy can be seen with.. well “real-time” so to speak, even some of those might just poof suddenly (that would be unlikely though).