I was watching When Aliens Attack on National Geographic. If aliens are so smart with all their technology, I feel like they would be smart enough to attack us before our technology evolved like it has.

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National Geographic's 2011 docudrama When Aliens Attack is as much a work of science fiction as it is a documentary. That means that, while much of the details incorporated into the film are grounded in actual science, and the film includes interviews with many real-life experts on the subject of astronomy, the production itself involves speculation regarding something that has never and may never actually occur. As such, the writers and director were free to shape the narrative in any way they envisioned. That this particular film depicts an invasion of Earth by beings from a distant world should in and of itself have suggested that the people putting the film together had liberty with the details and outcome.

It could logically be assumed that any life form capable of transiting many light years and launching an attack on another planet would be possessed of superior intellect and technology. After all, those countries leading the world in the area of space exploration are struggling to get back to the relatively close Moon, budgets and technological limitations having precluded greater advances in manned space travel. Unmanned probes have been successfully launched to the outer reaches of the solar system with one, Voyager 1, having actually departed the solar system for the universe beyond. Technologically speaking, that's not nothing. It is, however, a far cry from the manned mission to Mars that many space enthusiasts champion.

An alien civilization capable of traveling such distances as would be required would definitely have a technological edge, but that edge might be irrelevant in the Earth's atmosphere. Presumably protected within the confines of their vehicle(s), such life forms might not be capable of existing outside of those vehicles, just as human beings cannot exist on the Moon without being equipped with specially designed breathing apparatuses. In short, we just do not know what might be the actual physical characteristics of any such alien beings. Whether human beings would be capable of countering an alien attack is therefore dependent upon levels of knowledge and detail that we simply do not possess. Within the context of a speculative scenario involving an alien attack, then, any outcome posited could be credible.

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How can we really know what aliens know or do not know or what they have done, will do, or may yet do to us?  Has anyone met an alien or do they even exist? 

Unless we have actual facts about aliens, everything scientists tell us is mere conjecture based upon what they know using today's technology.  It would be like someone 100 years ago in our history, who used a horse and wagon, trying to describe today's automobile.  Everyone would use the terminology of his day and it might sound pretty funny to someone in the future who is used to such things.

I think there have been too many science fiction movies, books, and supposed UFO sightings over the years.  If and when  an alien invasion should occur, it may or may not have been preplanned for...

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a certain time in our planet's history and they (the aliens) may or may not have been watching us.  If they need something our planet has to offer they will take it when they need it regardless of our current technology.  And if they have the means to travel such great distances I think we could safely assume they are more technologically advanced than us and there would probably not be much we could do to stop them. 

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First of all, you're assuming that the aliens had the ability to pick their time to come and invade us.  What if they just got the capability of coming across huge distances to attack and could not have gotten here 100 years ago?  Or what if 100 years ago they had a peace-loving government but, in the meantime, they have developed a government that is more aggressive? 

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I assume we watched the same episode. If you will continue to watch that you will see that the aliens probably a century or a millenium advanced that our civilization. But we are not sure neither they are not sure as well. 

apparently they have detected us using their high-tech gadgets but they can never be sure enough to propose an alien attack.

i can see a simple reason.

they are waiting for the proper time for a beneficial attack. They may have seen that the atmosphere of the earth are not conducive for their survival; Oxygen and Nitrogen might be deadly to their bodies thus making them hard to breathe. And another thing, If aliens do exist, apparently there are millions to billions Extra-terrestrial beings. So if for say there are a million ET's there are a small probability that they will attack us we are one of the millions (or billions) thus negligible. Or they are focused on finding a new planet instead of collonialization.

hope this helps.

p.s. i guess there is a part two in that report in nat geo. stay tuned :)

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