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A computer recorded the signal as six letters and numbers. astronomer jerry ermin saw the letters 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 "end of 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 ...

Astro physicist stephen hawking says it's possible, and issues a warning for all of us. stop trying to contact other life forms now, just in case they're out there and they're hostile. >> they are likely to be more advanced that us. >> hawking joins us, answering our questions, sounding the alarm. and believer dan aykroyd is here too. >> i don't belief they're a mass threat, but they're breaking the law. >> larry: aliens from out of space real threat to human life? next on "larry king live." >> larry: good evening. you can say that this show tonight is out of this world. john smithson is execu...

Ours. and we're talking even if it is one in a billion, then there are billions of dollars. so we're playing a big numbers game here. >> larry: john, was this fun to do? is he easy to work with? >> it was -- it was fun, but it's probably the most complex and challenging program i've ever been involved with because you're dealing with the most ferociously complicated story, most ferociously complicated science imaginable, but we were trying to make it in a way that people like myself could understand. so it was -- it was brain-numbingly difficult, but also really good fun. and stephen hawking i...

Credentials to second guess professor hawking. i'm prepared to believe him because he is such a great scientist. and what we said about aliens in that program was very much what stephen hawking wanted to say. for years he had been lecturing about -- about lots of things, including the possibilities of alien life. what we were 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: how did this come about? how did you and stephen and john all get together a...

Brain-numbingly difficult, but also really good fun. and stephen hawking is just a remarkable man. i mean he -- he just has this presence. everyone feels it. we did something with him last night in london. and the whole room stops when he comes in. he has, you know, it's weird. we almost talk of him as a rock star of science. 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 is something about that that is such a powerful and poignant image. it just seems to touch people. >> larry: thank you both very...