fourier jr said:
"If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans."
I'll have to disagree with Mr. Hawking.
Mr. Hawking clearly made an analogy on a possible contact with an advanced civilization in the nearer future with the human experience that happened on the 15th century, but is this an accurate analogy?
Well, it seems, as Human History has shown us, that most, if not all, contacts between two different civilizations end up on the most advanced and predispose taking advantage of the least predispose one.
Can this behavior be observed on a different species? Yes. Even if we take as an example an irrational species, we are likely to observe this same pattern. As this is a natural consequence between populations of certain species, if both populations come into contact, that is, start to coexist in the same environment, it is very likely that the most fit will eventually conquer the region and natural resources, as both populations can be seen as intra-species competitors.
But what if we consider a very intelligent civilization, far beyond ours? As rational beings, would they still follow this behavior or would they have a deeper understand of our position in the Universe?
This raises a lot to think, but in the way I see it, I don't think that a civilization that masters interstellar traveling would search all the Universe for intelligent life (which is way rarer than Life itself) and then simply annihilate them to take over their planet.
Mr. Hawking's position sounds very dramatic in my humble opinion.