“THE 100 YEAR STARSHIP (100YSS) is a joint U.S. Defense Advanced Research Projects Agency (DARPA) and National Aeronautics and Space Administration (NASA) grant project to a private entity. The goal of the study is … to create a business plan that can last 100 years in order to help foster the research needed for interstellar travel.”
http://en.m.wikipedia.org/wiki/100_Year_Starship