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You tune in the radio, you don't have to worry about the dj jumping into your home and giving you a hard time. that's a completely harmless sort of thing and interesting because it would tell you whether earth is really, really special, or whether there is enormous quantities of life out there. >> larry: but david, one thing it has done with stephen hawking talking about it, it has opened many eyes, hasn't it? >> oh, yes. the problem is that everybody seems to have their own idea of of course what aliens ought to be like. we all say of course our broadcasts have already been detected by now. w...

Television, but they might pick up our very strong radars. look, if they have the technology to come here and actually threaten us, they long ago could have the technology to pick up our signals. they'll know we're here. >> larry: david, succinctly put, what do you believe? >> well, that's the whole point, larry. as an astronomer, as a science fiction author, i've been thinking about is the alien, discussing the alien with everybody i could for the last 50 years. and what i believe is that everybody is too strong in their beliefs right now. seti, the search for extraterrestrials is called the ...

But you can work out the cost of transport, and this would be like ordering a book from amazon and paying $6,000 for the shipping. we're not -- you wouldn't do that, and the aliens are not going to come here for that. could they come here for some other reason? possibly. but you know, david brin said that they might not pick up our television, but they might pick up our very strong radars. look, if they have the technology to come here and actually threaten us, they long ago could have the technology to pick up our signals. they'll know we're here. >> larry: david, succinctly put, what do you ...

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 executive producer of end of the universe with stephen hawking, . stephen hawk willing join us later. warns that contact with extraterrestrial life might not go so well. watch. >> 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 well for the native americans. >> larry: john, you're producing the show. do you accept the theory? >> well, ...

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 smithso...