I don't have a good answer for you. I'm not actually a space guru. I've picked up a lot of stuff over the years and I general know what I'm talking about, but I don't have the deep knowledge that was required to figure this stuff out in the first place.

What I can say is that we can calculate a lot more than we can observe. So, logically, you are right. But I honestly have no idea of we can calculate the size we think it is. I also can say that, even if we could calculate it, it's effectively a meaningless value because we could never verify it.