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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 ha...

>> larry: aliens from out of space, a real threat to the 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 executive producer of "into the universe with stephen hawking." as is ben, both joining us from london. in their documentary astro physicist stephen hawking will join us later, warns that contact with extraterrestrial life may not go so well. watch 3 >> so if aliens ever visit us, i think the outcome would be much as when christopher columbus first landed in america. which didn't turn out very...

The argument logically, then he thinks that we would be wise to be -- to exercise caution when dealing with aliens. >> larry: so what do we do with this, john, other than entertain and inform us? what's the next step? >> well, what we're trying to do with this -- you know, what is just so amazing about this subject, it just blew my mind. 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 sta...

Science, definitive science what we know about the cosmos, but in an educating and in an informative and in an entertaining way so that a global audience on discovery channel could be sort of interested in this. >> larry: ben, does the british government take this seriously? >> i'm not -- i'm not sure i'm qualified to answer that, but i don't think so. >> 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...

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 the most sensible approach. i'm not one to call whether aliens will come here and stroke us and pet us or zap us with lasers. i think we just don't know, and therefore you can't really 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 second gue...