I have to say that episode blew my mind pretty much out of the water. Funny thing you should be talking about this because I decided to do a little research on how many theories there are on this finite or infinite universe theory and found this on Space.com:

http://www.space.com/scienceastronom...rd_list-2.html

I personally believe that perhaps there is a bubble universe out there with parellel universes right next to ours. I do have question though about how the Universe is expanding...

Q: The pictures I've seen on how our Universe is expanding made me wonder about the two polar regions (I couldn't think of a better word to use to describe it) you see on the top and bottom of the expanding universe. Are we expanding all around (horizontally and vertically) or are we simply expanding just horizontally?

Sorry if that was a "noob-ish" question!