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But Musk remains a dreamer, not just a businessman. He did not create SpaceX to get rich for the second time. Instead, he is risking his fortune to start a company in a field most people said could not support a project like SpaceX. Again and again, he returns to the themes that keep him going. He sees what SpaceX is doing as part of humanity's destiny. "I think life on Earth must be about more than just solving problems… It's got to be something inspiring even if it is vicarious. When the US landed on the moon it was for all humanity. We count that as a human achievement. Anyone who could get near a TV got near a TV. If there was one TV in an African village and you had to walk 50 miles to get there, you'd do it," he says.
And through it all is the desire to colonise Mars. Musk insists that his most powerful Falcon 9 rockets could already launch missions to Mars if assembled in Earth's orbit. He wants SpaceX to help humanity spread into space, just like the first European explorers setting out for the New World. "One of the long-term goals of SpaceX is, ultimately, to get the price of transporting people and product to Mars to be low enough and with a high enough reliability that if somebody wanted to sell all their belongings and move to a new planet and forge a new civilisation they could do so."
Musk's belief that this can be achieved in two decades is something that most experts would scoff at but Musk, characteristically, finds it frustratingly slow. "Twenty years seems like semi-infinity to me. That's a long time," he says, as if surprised that anyone could doubt his aims. It is certainly tempting to dismiss it as a flight of fancy. Except, behind him on SpaceX's factory floor, Musk's nascent fleet of working space rockets are already being built.