Originally Posted by
lavos
First, you would have to invent it. With the current technology, colonizing exoplanets doesn't seem feasible. This is the reason Musk is set on more realistic endeavors such as Mars. The problem with Mars is that it would have to be terraformed, but it could be a good option due to the fact that all the planets in the Solar System are heating up, due to some unknown phenomenon. It could become inhabitable in the near future. Much later, when we invent time-warp facilitators and hiperspatial drives, exoplanets might become a possibility. But in the case that we were caught red-handed with some catastrophic phenomena that endangered the continuity of life on this planet soon, we would have to build a multigenerational Ark to take us to the most viable exoplanet that could sustain life. I believe this could be done with current technology. But if I'm not mistaken, there are still the Van Allen belts (sort of a radiation shield that envelops the Earth and kills any living being that wanders too far, and are not easy to shield against) which are an insurmountable problem that still hasn't been solved, if any non-close orbit space travel is going to be achieved.