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I believe there will be breakthroughs in our understanding of physics that will enable us to travel out of this solar system. Our knowledge of the universe is in it's infancy, we've only been at it for a short period of time. It is knowledge that will have to grow exponentially. Hopefully a comet strike, solar flare or some other disaster doesn't get us first.
Perhaps that exponential leap in knowledge will come if we can make contact with advanced alien life. But then, they may be hoping to contact us for the same reason.
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