Realistically, the reasons outlined by the Cool Worlds video above, the only way we'd be venturing outside of our solar system is through autonomous crafts/probes or what some researchers/futurists think will eventually happen whereby human consciousness and computers become one. With AI growing as fast as it currently is, the long predicted technological singularity in the mid 2030s seems ever more likely. Biological bodies simply won't last through the timescales needed to travel even within our own galaxy, let alone the radiation they will have to endure. We're just not built for space travel, but machines are. I guess this is one major reason why one part of the scientific community think that intelligent life capable of space travel must be non biological as it's the only type of life that could survive in space.