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Hawkings 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 than us. >> larry: hawking joins us, answering our questions, sounding the alarm. believer dan aykroyd is here too. >> i don't thing they're a mass threat. >> larry: aliens from outer space. real threat to the human race? next on "larry king live." good evening. you could say this show tonight is out of this world. john smithson is executive producer of "into the universe" with steven hawking, as ...

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 ...

Say -- you can't say one way or the other. you can think maybe caution would be a good idea. >> larry: stephen theorizes the negative aspect, does he not, john? >> he rightly thinks we should be cautious, and i'm not going to secondguess professor hawking. but that is what is so intriguing, isn't it, about this whole subject? could there be life out there? if so, is that just some sort of green gloop or is it something that is a real menacing threat? that's what we don't know. many better scientific minds than mine are obsessed with looking. i think you've got guests later who will tell us a l...

>> on august 16th, 1977, a radio telescope in ohio picked up a signal that became famous. the signal was a steady source of radio waves, just the kind an alien race might send because it stands out from the radio static that fills the universe. 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 opin...

I'm not a scientist. my job is to make tv programs. what blew my mind is the huge scale of the universe. i'll never look at the night sky the same way again. just during the three years we've been making this show, someone told me the other day 300 billion stars have been born. 300 billion stars have died. these are just awesome figures. and what we're doing next really is just -- literally what we're doing next on sunday night is the ultimate story on the discovery channel, the ultimate story of how it all began 14.7 billion years ago, and how it might all end. and it is really the ultimate s...