In this May 29, 2014 photo, Elon Musk, CEO and CTO of SpaceX, introduces the SpaceX Dragon V2 spaceship at the SpaceX headquarters in Hawthorne, Calif. Musk predicted during an interview at the Code Conference in southern California on June 1, 2016, that people would be on Mars in 2025.
In this May 29, 2014 photo, Elon Musk, CEO and CTO of SpaceX, introduces the SpaceX Dragon V2 spaceship at the SpaceX headquarters in Hawthorne, Calif. Musk predicted during an interview at the Code Conference in southern California on June 1, 2016, that people would be on Mars in 2025. Jae C. Hong AP
In this May 29, 2014 photo, Elon Musk, CEO and CTO of SpaceX, introduces the SpaceX Dragon V2 spaceship at the SpaceX headquarters in Hawthorne, Calif. Musk predicted during an interview at the Code Conference in southern California on June 1, 2016, that people would be on Mars in 2025. Jae C. Hong AP

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