Are we alone in the universe? A question every one of us has asked ourselves at some point. While we are thinking about the odds of the Earth being the only habitable planet in the universe, or not, one of the things we might consider is how big the universe is. Let’s look at that with the help of treemaps! In this tutorial, we will be visualizing the scale of the 10 largest galaxies in the known universe using the treemapping technique.