I read a couple of days ago that we have only recently began to realize how big the Universe really is. In my imagination, around the time of Galileo, we began to realize that the Universe was much bigger than our galaxy. It turns out that is not true.

In an article that I can't find now, the author wrote about our idea of the universe about a hundred years ago. Then, we thought our galaxy was the entire universe and the milky way was thought to be about 1,000 times smaller than we now think.

If history is any indicator, this video underestimates the actual size of the universe.