"Darpa recently launched a program called the 100 Year Starship, which is exactly
what it sounds like: an effort to achieve interstellar flight by the year 2111. This
being Darpa, they’re dead serious. And they also recognize that 2011-era
technology probably isn’t good enough to forecast the state of the art over the
next 100 years."
See:
http://www.wired.com/dangerroom/2011...tellar-flight/