The Universe

It confuses inferior minds such as my own. It's so confusing. Where does it end? Where does it begin? How big are we as a planet in comparison? How big am I in comparison? Just a tiny germ on the foot of a big man's shoe, I guess. My dad just walked in and said "They're saying they're going to estimate it's size." I don't know who they are. It must've been on the news. But this is what I don't understand: How can you estimate the size of something you know almost nothing about?