The biggest issue with interstellar colonization is propulsion technologies. Warp drive may be theoretically possible but would require so much energy that you would have to annihilate Jupiter to power a single trip. Wormholes would require negative mass exotic matter which hasn't been proven to exist and most likely doesn't. At sub-luminal speeds we are talking about thousands of years to make it to the closest star unless we can found a propulsion technology that can accelerate the exhaust to a large percentage of the speed of light. The only such device I have found is the Beamed Core Anti-Matter Rocket which has an exhaust velocity of 100,000,000 m/s. However, it requires massive amounts of anti-matter. Currently anti-matter can only be produced at about a 0.01% efficiency but 50% is theoretically possible. To power a single ship to a single star in only a 100 years, would take over 100 years of producing anti-matter with a Dyson sphere like ring around the Sun, producing 3 exawatts of power. It would be a tremendous undertaking.
Anyways, this is just what I have found during my own research for a science fiction universe. Please check out my blog, blog.fractalfederation.com, I'd love to collaborate. Fractalfederation (talk) 01:44, February 1, 2016 (UTC)