Just a thought, and before anyone can beat me to it. "Why are we here?"
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Interstellar travel is almost certainly thousands of years away from our current technological state. We need to get some better understanding of quantum physics and quantum [i]engineering[/i] before we'd be able to bring the concept of traveling to another star within a reasonable amount of time a feasibility. Colonization of the Solar System, though, I'd assume may begin a little bit before the start of the next millenium.