There are many problems to solve before we can send a spaceship to another star system. About the only thing most folks agree on is that at some point we must make the journey or eventually humans will join the dinosaurs on the species extinction list.
We don't know when that day will come, whether we will bring it on ourselves by nuclear or environmental disaster, or if Mother Nature pulls the trigger with an asteroid impact, a global natural disaster or just because the Earth is poorly positioned to outlive the eventual death of the sun.
Read More: http://news.discovery.com/space/the-100-year-plan-for-space-travel-111003.html
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