about aliens in that program was very much what steven hawking wanted to say. for years he had been lecturing about the -- about lots of things including the possibilities of alien life. what we are able to do, for the first time using the wonders of computer graphics, was to visualize with professor hawking hypothetically what they might look like. that's what we're able to do here. >> larry: ben, you did this come about? how did you and steven and john all get together and do this. >> well, discovery wanted to do a new siexciting show. we sat around the table a while and thought who best to do it? there isn't a bigger name than steven hawking. it was a very simple, short, short list for who we wanted to work with. then we pitched it to him, and you may know this even takes quite a while to respond to