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epa05559459 South African physicist, inventor, and SpaceX founder Elon Musk addresses the press during the 67th International Astronautics Congress in Guadalajara, Mexico, 27 September 2016. During the presentation, Musk outlined his plan to design spacecraft to aid in the human colonization of the planet Mars within 40 to 100 years. EPA/ULISES RUIZ BASURTO