Today we're bringing in the big guns - questions about our universe as a whole, including its shape, whether it's finite or infinite, and more. I bet you haven't thought too much about this before, but once you dive in, you can't stop - it's just so cool to envision! Is our universe flat? Spherical? Hyperbolic? And exactly how large is it? To be honest, we aren't completely sure, but I'll tell you where we're at right now . . .