Because of the vastness of space in the distance in between planets and stars, the only aliens that would be able to travel to our small planet on the edge of the galaxy would have had to have mastered the manipulation of time and gravity.
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Are human civilization may go extinct because of nuclear war, or even global warming. All of this before we had a chance even to get to her closest planet, Mars. These are major hurdles that are Eileen visitors must've already overcome.
It is a sad thought that the human race my faceits own extinction after 300 years of an industrial revolution.
we'll be ok.. we'll survive in some form.. we probably won't stay the same for long and I'm sure we do have the ingenuity to survive. we're pretty smart and I'm sure there are lots of Eileens out there watching our every move. I don't think nuclear war will end us and in fact I'd go so far to say that we won't have nuclear weapons in 50 years time, but we will have spaceships capable of interstellar travel ;)
I think it's fair to say that if you've managed to get to another star system (our nearest being Alpha Centauri @ 4.367 light years) you've mastered manipulation of lots of stuff we're just beginners at.. bending gravity or folding time is a popular idea as are wormholes. and let's face it, until you crack it, you're just buzzing around your own solar system. I mean we do have hundreds of bodies in our own solar system and we've (apparently) only set foot on one so far and sent robots to a couple more. we've got lots of practice to do just learning to land / decelerate into orbit and get home again.
on the other hand you could send robots at a decent fraction of light speed without bending time and be at Alpha Centauri in 20 years.. but it would be so boring waiting a whole career to hear the robot say, yeah it was alright, there wasn't much to see ! I love Sci-fi for its ability to transport us to other worlds, other times and more importantly other paradigms.. how else do we get there ?