I feel so happy after watching this video. This is an old video (3 years old) of two of my favorite people talking about the Universe. NdGT, as usual, is passionate and articulate and he lights up every time the subject of astrophysics comes up in a conversation. Jon Stewart seems to genuinely enjoy giving this interview, though brief.
The video, spliced into two parts, is only available at the Daily Show website (not on Youtube, sorry):