When Elon Musk takes the stage of the 67th International Astronautical Congress in Guadalajara, Mexico, on Tuesday, it won't be to rehash terrestrial concerns like a fatal Tesla autopilot crash or a poorly received merger proposal. The space and electric-car entrepreneur will be talking about realising his boyhood dream: going to Mars. Musk's keynote address, "Making Humans a Multiplanetary Species", will tackle the challenges and "potential architectures for colonising the Red Planet", according to organisers. No one has been anticipating the event more eagerly than Musk, who founded Space Exploration Technologies, his rocket-launch company, 14 years ago with the goal of putting humans on other planets to live and work. "I think it's going to sound pretty crazy," Musk said, referring to his Mars speech, at Nasa's Kennedy Space Centre last April where he was celebrating launching a rocket into space and then landing the 14-storey-tall booster on a drone ship in the Atlantic Ocean. S...

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