SpaceX CEO and Chief Designer Elon Musk delivers the commencement address for Caltech graduates in Pasadena, Calif. Friday, June 15, 2012. Fresh off SpaceX's historic return from the International Space Station, Musk said Friday that he would like to see humans settle Mars and become a "multi-planet species." The 40-year-old entrepreneur reiterated his vision to graduates at the California Institute of Technology, a private university 10 miles northeast of Los Angeles known for its science and engineering programs. (AP Photo/Damian Dovarganes)

Associated Press
SpaceX CEO and Chief Designer Elon Musk delivers the commencement address for Caltech graduates in Pasadena, Calif. Friday, June 15, 2012. Fresh off SpaceX's historic return from the International Space Station, Musk said Friday that he would like to see humans settle Mars and become a "multi-planet species." The 40-year-old entrepreneur reiterated his vision to graduates at the California Institute of Technology, a private university 10 miles northeast of Los Angeles known for its science and engineering programs. (AP Photo/Damian Dovarganes)
SpaceX CEO and Chief Designer Elon Musk delivers the commencement address for Caltech graduates in Pasadena, Calif. Friday, June 15, 2012. Fresh off SpaceX's historic return from the International Space Station, Musk said Friday that he would like to see humans settle Mars and become a "multi-planet species." The 40-year-old entrepreneur reiterated his vision to graduates at the California Institute of Technology, a private university 10 miles northeast of Los Angeles known for its science and engineering programs. (AP Photo/Damian Dovarganes)
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