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<blockquote data-quote="Snaketibe" data-source="post: 462717" data-attributes="member: 7379"><p>Absolutely, and it's the one thing H.G. Wells almost got right with 'The War of the Worlds', where Earthly pathogens ultimately killed all the invading Martians, although quite frankly, it's just as likely that Martian pathogens would have killed all the humans!</p><p></p><p>Any physical visit to or from any other life-bearing planet / moon / spaceship, in whatever form that might take, poses an astonishing risk of complete and utter annihilation at the hands of bacteria and diseases against which we (and they) have no defence whatsoever. It will be the Europeans visiting South America times ten thousand.</p><p></p><p>It's all rather moot however since, as has already been pointed out, faster than light travel is, to the very best of our current understanding, completely impossible, and so travelling anywhere outside of our own solar system within a human lifetime is a pipe dream of the highest order. As theforceuk quite rightly states, really lightweight laser / photon thrust space probes travelling to Alpha Centauri at 20% the speed of light may eventually be possible (and it really will be exciting and amazing if it happens!), but that's still a 20 year one-way journey, and if we want the probe to actually see what's there when it arrives, it's presumably going to have to spend several additional years decelerating or go bulleting through the AC solar system and see bugger all. And scaling up such a craft to carry humans would be monstrously difficult and expensive, and the astronauts sent on such a trip would likely die in a thousand different unforeseen ways before old age caught up with them.</p><p></p><p>However, I am quite happy to concede that UFO's exist, since by definition any flying object that you cannot identify is a UFO (although once you know what it is, it becomes an IFO ;-)). That certainly is not the same thing as saying that they are extra-terrestrial in origin, however. Weather balloons, clouds, aircraft, satellites and birds have an awful lot to answer for with the gullible ;-)</p></blockquote><p></p>
[QUOTE="Snaketibe, post: 462717, member: 7379"] Absolutely, and it's the one thing H.G. Wells almost got right with 'The War of the Worlds', where Earthly pathogens ultimately killed all the invading Martians, although quite frankly, it's just as likely that Martian pathogens would have killed all the humans! Any physical visit to or from any other life-bearing planet / moon / spaceship, in whatever form that might take, poses an astonishing risk of complete and utter annihilation at the hands of bacteria and diseases against which we (and they) have no defence whatsoever. It will be the Europeans visiting South America times ten thousand. It's all rather moot however since, as has already been pointed out, faster than light travel is, to the very best of our current understanding, completely impossible, and so travelling anywhere outside of our own solar system within a human lifetime is a pipe dream of the highest order. As theforceuk quite rightly states, really lightweight laser / photon thrust space probes travelling to Alpha Centauri at 20% the speed of light may eventually be possible (and it really will be exciting and amazing if it happens!), but that's still a 20 year one-way journey, and if we want the probe to actually see what's there when it arrives, it's presumably going to have to spend several additional years decelerating or go bulleting through the AC solar system and see bugger all. And scaling up such a craft to carry humans would be monstrously difficult and expensive, and the astronauts sent on such a trip would likely die in a thousand different unforeseen ways before old age caught up with them. However, I am quite happy to concede that UFO's exist, since by definition any flying object that you cannot identify is a UFO (although once you know what it is, it becomes an IFO ;-)). That certainly is not the same thing as saying that they are extra-terrestrial in origin, however. Weather balloons, clouds, aircraft, satellites and birds have an awful lot to answer for with the gullible ;-) [/QUOTE]
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