I've gained most of my Sci-Fi knowledge from Futurama, and I guess you could say we aren't alone in terms of species, whether there is another species out their which is "intellgient" we will probably find out one day! If there are indeed 10,000 possible earths out their it really does show you the really small chance of life, only 10,000 in a universe that is forever expanding! And then on those 10,000 planets to get an intelligent lifeform evolved as mcuh as we have - well I really think that that is probably also 1 in 10,000 which would probably put us as the only planet with intelligent life form!
Thats not to say I am right, I think there quite possibly could be another intelligent life form out there - what about in a parallel universe somewhere!
I think our own planet is bad enough to content with first, you are right we do need to unify, but space travel and collinization should not be considered until Planet Earth is "correct". In that we have no starvation, no poverty, no conflict etc.
We may need to re colinize at the current rate we are destroying the world.
I think it depends would aliens "attack" if they do attack, whats to say the aliens will not be like us and want to be friendly and learn more knowledge - do all stereotypical aliens want to blow up the earth and kill all the humans!
The universe is a big place, we need faster travelling speeds before we can really explorer it efficently.
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