The video presents an interesting and simple way to explain how we measure the universe without intergalactic rulers. According to modern science, universe is so large that even with the speed of light, it would take trillion of years to reach to the point that we have discovered the universe to be.
On top of it all, the fact is that the universe is going through an ever expanding phenomenon which makes it difficult to be certain about its size. But the question is, how do we measure the things from this far a place as sitting on some spot on earth. This video on the video-sharing site, Vimeo, answers just that.