thanx for the post... but i doubt what it says about stephen hawkings.. here this guy says that stephen hawking had said that aliens know about us very well but he wonders why they never conquer us... so i searched through the internet and i couldn't find he says something like that.. its a great pleasure if anyone could find me out that... but he had said something like this..
" To my mathematical brain, the numbers alone make thinking about aliens perfectly rational. The real challenge is to work out what aliens might actually be like.
We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet. I imagine they might exist in massive ships, having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach.
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."
source
http://tech.blorge.com/Structure: /2010/04/25/stephen-hawking-aliens-definitely-exist/
so this is contradiction with what this video says about steven hawkin's saying...
therefore for me this video is just a someone's try to make others consent with his own view.. by the way thanx to the post i could add up some new things to my knowledge...