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SpaceX founder Elon Musk speaks during the 67th International Astronautical Congress in Guadalajara, Mexico, Tuesday, Sept. 27, 2016. In a receptive audience full of space buffs, Musk said he envisions 1,000 passenger ships flying en masse to Mars, 'Battlestar Galactica' style. He calls it the Mars Colonial fleet, and he says it could become reality within a century. Musk's goal is to establish a full-fledged city on Mars and thereby make humans a multi-planetary species. (AP Photo/Refugio Ruiz)