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>> larry: john -- well, ben, you first. the tendency has been to kind of dismiss this, until mr. hawking arrived, as kind of kooky, right? >> maybe it's been overstated slightly from what he actually says in the film. what he says in the film is that if intelligent aliens exist -- that's a big if -- and that's were to meet us, that's another big if, then we might be wise to treat them with caution. it's not stephen saying as far as i know in any way, stephen is not saying aliens are coming, we've got to hide under the bed. he is not trying to frighten anyone. he is just saying if you follow th...

Life may not go so well. watch. >> so if aliens ever visit us, i think the outcome would be as when christopher columbus first landed in america. which didn't turn out very well for the native-americans. >> larry: john, do you -- you're produces ting the show. do you accept the theory? >> well, we're working with one of the greatest living scient t scientists, one of the best scientific brains in the world. i'm not a scientist. my job on the discovery channel was to bring the views, imagination of the great scientist to a mass audience. these are the words of professor hawking. i am not -- don...

He has this extraordinary aura about him. and we just know that trapped in this body that he can't use is this quite brilliant brain. and there's something about that that is such a powerful and poignant image that i know it just -- it just seems to touch people. >> larry: thank you both very much, john smithson and ben bowie. the second part of this special will air sunday on discovery. we'll be back. we'll talk with stephen hawking and we'll meet an expert panel as well. stephen hawking in his own words, next. to the seekers of things which are one of a kind. the authentic, the rare, the har...

A computer recorded the signal as six letters and numbers. astronomer jerry ehman saw the data and wrote one word in the margin. >> larry: this is a remarkable, remarkable entertaining feature that will air on discovery sunday. john smithson and ben bowie are the executive producers of "into the universe with stephen hawking." this would be an opinion, ben. do you think we would be hostile or not hostile to another environment coming here? >> do i think -- i don't think you can really say. i think the only thing you can say is that you don't know. if you don't know, then caution seems to be th...